Product Overview

Our premium Step Drill Bit (also widely known as Pagoda Drill Bit, Step Cone Drill, Unibit, Multi-Step Drill, Hole Enlarging Drill, Sheet Metal Drill Bit) is a professional industrial-grade multi-functional drilling tool, specially engineered for one-time hole making, hole enlarging, deburring and chamfering in various materials.

We provide a full range of specifications with 2 core flute designs (straight flute & spiral flute) and 2 premium material options (HSS M2 & HSS M35 Cobalt), with titanium nitride coating for enhanced wear resistance. One drill bit can replace multiple traditional twist drill bits, realizing multi-size hole processing in one operation, no need for frequent tool changes. It is universally compatible with hand electric drills, bench drills, magnetic drill presses, and impact drills, making it the most cost-effective drilling solution for metal fabricators, electricians, HVAC engineers, maintenance technicians, and DIY enthusiasts worldwide.

Core Advantages & Detailed Product Features

1. Dual Premium Material Options, Full Scenario Coverage

• Standard HSS M2 Model: Made of industrial-grade W6Mo5Cr4V2 high speed steel, with overall quenching and tempering treatment, reaching a hardness of HRC 62-64. It features excellent wear resistance and toughness, perfect for drilling on wood, plastic, PVC, aluminum, copper, and thin mild steel sheets, ideal for daily maintenance and light industrial processing.
• Upgraded HSS M35 Cobalt Model: Added 5% cobalt to the HSS matrix, with an enhanced hardness of HRC 65-67. It has significantly improved red hardness, maintaining sharp cutting edges even under high-temperature continuous cutting conditions. It is specially designed for drilling medium and high hardness materials like stainless steel (304/316), alloy steel, quenched and tempered steel, with a service life 3x longer than ordinary HSS drill bits.

2. High-Performance Surface Coating, Enhanced Wear Resistance

• Titanium Nitride (TiN) Coated Model: Golden TiN coating with a hardness of up to HV2800, effectively reduces cutting friction, improves wear resistance and oxidation resistance, extends the service life of the drill bit, and provides smoother cutting performance on non-ferrous metals and non-metal materials.
• Cobalt Enhanced Coating Model: Professional cobalt-based coating for high hardness metal drilling, further enhances the high temperature resistance and wear resistance of the M35 cobalt drill bit, perfectly adapts to the harsh cutting environment of stainless steel and alloy steel, reduces edge chipping and wear.

3. Optimized Flute Design, High-Efficiency Chip Removal & Cutting

• Straight Flute Design: Precision ground straight flute, provides stable axial feed, easy to control the drilling depth, perfect for hole enlarging, chamfering and deburring operations, especially suitable for thin sheet metal processing, with clean and burr-free hole edges.
• Spiral Flute Design: Optimized 35° helical flute, provides continuous and smooth cutting, faster drilling speed, and more efficient chip evacuation. It effectively reduces cutting resistance and vibration, ensures smoother hole wall finish, ideal for deep hole drilling and continuous processing on hard materials.
• All flutes are precision polished, with smooth surface, no burrs, ensures unobstructed chip removal, avoids chip clogging, and reduces cutting heat buildup during long-term operation.

4. Precision Ground Cutting Edges, Ultra-High Drilling Accuracy

• Each step cutting edge is precision ground with strict tolerance control, ultra-sharp cutting edges, minimal cutting resistance, and smooth feed. The two-flute symmetrical design ensures even force during drilling, low vibration, and high concentricity, completely avoiding hole deviation and aperture error.
• The stepped design with 2° back taper per step ensures smooth stepping between different hole sizes, no stuck, no jumping, realizes one-time continuous drilling from small hole to large hole, no need for step-by-step drilling with multiple drill bits, greatly improving work efficiency.
• The drill tip is specially designed with a centering point, which can quickly locate and start drilling without pre-drilling a pilot hole, even on curved surfaces and inclined surfaces, ensuring accurate positioning and no slipping.

5. Clear Laser Marked Size Scale & Anti-Slip Shank Design

• Each step is marked with clear and permanent laser engraved size scale, which is wear-resistant and not easy to fade, easy to identify the drilling size during operation, accurately control the hole diameter, and avoid wrong size processing.
• Adopts anti-slip triangular shank design, which is universally compatible with most hand electric drills, bench drills, magnetic drill presses, and impact drills on the market. The triangular structure prevents slipping in the chuck during high-load drilling, ensures stable power transmission, and improves operation safety.
• The shank is precision ground, with strict dimensional tolerance, perfect fit with the drill chuck, no runout during high-speed rotation, ensures drilling accuracy.

6. One Bit Multi-Function, Cost-Effective & Widely Compatible

• One step drill bit can replace 5-15 traditional twist drill bits, realizes multi-size hole processing in one operation, no need for frequent tool changes, greatly saves your tool procurement cost and operation time.
• It can complete multiple processes in one operation: hole drilling, hole enlarging, chamfering, deburring, and countersinking, one bit for multiple purposes, perfect for on-site construction and maintenance operations.
• Universally compatible with most rotary drilling tools, including corded/cordless hand electric drills, bench drills, magnetic drill presses, milling machines, and impact drills (with drill mode), no need for additional tooling, plug and play.

Wide Application Scenarios & Compatible Materials

Compatible Workpiece Materials

• HSS M2 TiN Coated Model: Wood, plywood, MDF, plastic, PVC, acrylic, aluminum, copper, brass, thin mild steel sheet, galvanized sheet
• HSS M35 Cobalt Model: All materials of the M2 model, plus stainless steel (304/316), alloy steel, carbon steel, quenched and tempered steel, cast iron, and other medium & high hardness metals

Main Application Scenarios

This step drill bit is widely used in global industrial, construction, maintenance and DIY fields, including but not limited to:

• Sheet metal fabrication, metal cabinet and chassis hole making
• Electrical installation, switch box and junction box hole opening
• HVAC engineering, pipeline and ventilation duct hole drilling
• Automobile manufacturing, modification and maintenance
• Mechanical equipment installation, overhaul and on-site maintenance
• Furniture manufacturing, woodworking hole processing
• DIY home improvement, hardware processing, daily maintenance
• Shipbuilding, bridge construction, steel structure auxiliary processing

Packaging, Customization & After-Sales Service

Export-Standard Secure Packaging

• Single Bit Packaging: Each drill bit is individually packed in a transparent plastic tube, with a label marked with model, size and material, easy to store and identify.
• Set Packaging: 3pcs/4pcs/5pcs sets are packed in a high-strength plastic storage box / aluminum case / EVA foam lined color box, which is moisture-proof, compression-resistant, suitable for long-distance international transportation, and easy to carry and store.
• Customized packaging with your brand logo and private labeling is fully supported.

Customization Service

We provide full OEM/ODM customization services for global customers, including:

• Customized drilling range, step number and step spacing
• Customized material (HSS M2, M35, M42) and surface coating (TiN, TiCN, AlTiN)
• Customized flute type and cutting edge angle
• Customized shank type (triangular shank, straight shank, hex shank)
• Customized brand logo laser engraving and packaging design

After-Sales & Technical Support

• All our products have passed strict full-item quality inspection before delivery, with a 6-month warranty period for non-human damage.
• We have a professional technical support team to provide 7×24 hours online after-sales service, to solve any product use and technical problems for customers in a timely manner.
• We provide complete product information and customized solution support, to fully meet your different business needs.

Safety Operation Tips

1. Please select the appropriate material model according to the workpiece material: M2 TiN coated model for wood, plastic and ordinary steel, M35 cobalt model for stainless steel and high hardness alloy steel.
2. Please wear professional protective equipment during operation, including safety goggles, work gloves, to avoid injury from flying chips.
3. Please control the reasonable rotation speed and feed speed according to the workpiece material: low speed and slow feed for hard materials like stainless steel, to avoid overheating and edge chipping.
4. It is recommended to use cutting fluid or coolant during metal drilling, which can effectively reduce cutting temperature, extend the service life of the drill bit, and improve the hole quality.
5. Please ensure the drill bit is firmly clamped in the drill chuck before operation, and keep the drill bit perpendicular to the workpiece surface during drilling, to avoid breakage caused by deflection.