Drill bit set DeWalt DT4902-QZ, 3 mm diameter, 2 pieces, right-hand rotation

DeWalt DT4902-QZ drill bit set includes two 3 mm diameter cobalt-alloy bits engineered for right-hand rotation drilling. Designed primarily for metalworking, these 3 mm drill bits feature a high-speed steel body with 5% cobalt for improved heat resistance and tool life. The bits have a no-walk tip to reduce wandering on curved or smooth surfaces and a reinforced core to enhance fracture stability during freehand drilling. Supplied as a 2-piece set, the bits are suitable for replacement in compact toolkits or for small projects requiring repeated, precise 3 mm holes.

Advantages

The cobalt-alloy composition increases hardness and temperature tolerance compared with standard high-speed steel, enabling more reliable penetration of tougher metals. The no-walk tip improves start accuracy, reducing the need for center-punching in many applications. A non-slip cylindrical shank improves grip in the drill chuck for consistent torque transfer, while the strengthened central core reduces the risk of breakage during heavy or freehand use.

Suitable for

• Drilling small-diameter holes in steel and other ferrous metals
• Replacement bits for maintenance and repair tasks
• Precision metalworking and light fabrication
• Compact projects requiring consistent 3 mm hole size

Key specifications

• Diameter: 3 mm
• Material: High-speed steel with approximately 5% cobalt alloy
• Tip: No-walk (reduced walking) tip design
• Rotation: Right-hand rotation
• Shank type: Cylindrical, non-slip design for secure chuck grip
• Overall length: 61 mm
• Pack contents: 2 pieces
• Primary application: Metal drilling

How to use

Mark the drilling position on the workpiece and, if needed, apply a center punch for very hard or highly polished surfaces. Secure the workpiece and select a suitable drill with a compatible chuck for a cylindrical shank. Start drilling at low speed to establish the hole, then increase speed as appropriate for the material and bit size while applying steady, moderate pressure. Use cutting fluid or coolant when drilling metal to prolong bit life and reduce heat build-up. After use, clean and store the bits in a dry location to prevent corrosion.

Usage recommendations

Use cutting fluid when drilling ferrous metals, avoid excessive side loads to reduce risk of breakage, and ensure the drill chuck is tightened properly to prevent slipping. For repeated or deep holes, periodically withdraw the bit to clear chips and reapply lubricant.