Drill bit DeWalt DT4905-QZ — twist drill bit, right-hand rotation, 1 pc

DeWalt DT4905-QZ is a single twist drill bit designed for right-hand rotation and general metal drilling. Constructed from high speed steel with a cobalt alloy, the bit combines a strengthened central core with optimised tip and flute geometry to improve penetration, chip evacuation and wear resistance during rotary drilling. Supplied as one piece, this 4.5 mm diameter, 80 mm length twist drill is intended for use where a reliable, high-performance metal-drilling bit is required.

Advantages

The 8% cobalt content maintains a sharper cutting edge and provides significantly longer life compared with standard black oxide bits. The optimised tip and flute geometry doubles penetration speed and improves material removal while reducing heat build-up. A stronger central core increases resistance to breakage, and the no-walk tip helps start holes accurately without slipping on the work surface.

Suitable for

• Drilling holes in metal sheets and plates
• Fabrication and light-to-medium metalworking tasks
• Use with corded or cordless drills that accept standard twist bits

Key specifications

• Type: twist drill bit for right-hand rotation
• Material: high speed steel with cobalt alloy
• Cobalt content: 8% (improved hardness and wear resistance)
• Tip geometry: optimised no-walk tip for easier penetration
• Flute design: optimised for faster chip removal and reduced heat
• Core: reinforced central core for increased breakage resistance
• Diameter: 4.5 mm
• Overall length: 80 mm
• Pack: single piece
• Finish: gold-coloured coating

How to use

Install the twist drill bit securely into the drill chuck and tighten according to the drill manufacturer's instructions. Select an appropriate drilling speed for metal work—typically moderate to high speeds for this diameter—apply steady pressure and allow the bit to cut without forcing. Use cutting fluid or coolant for prolonged drilling or thicker material to reduce heat and extend bit life. Clear chips from the hole periodically to maintain efficient cutting and prevent clogging.

Usage recommendations

Use this DeWalt twist drill bit for general metal drilling tasks. For best results, pair with compatible drills and appropriate cutting lubrication, and store the bit in a dry place to protect the cutting edge. Inspect the bit before use and replace it when wear impairs cutting performance.