Bosch Drill Bit Set 2 609 255 127

The Bosch 2 609 255 127 drill bit set contains five high-quality twist drills in sizes 2, 3, 4, 5 and 6 mm, designed for accurate drilling in ferrous metals, hard plastics and sheet metal. These bits are intended for use with standard electric drills and drill drivers; their geometry and cutting edges are made to provide reliable chip removal and consistent hole quality across a range of common workshop and site tasks.

Advantages

The set offers a compact selection of commonly used diameters, allowing fast size changes without searching for individual bits. Each bit is manufactured to tight tolerances for concentricity and consistent diameter, which helps achieve cleaner holes and better fit for screws, rivets or dowels. The material and heat treatment deliver wear resistance for repeated use in tougher materials such as thin steel and hardened plastics. The bits are compatible with standard 1/4" hex holders and chucks used in most cordless and corded drills.

Suitable for

Key specifications

How to use

Select the appropriate bit diameter for the required hole. Secure the workpiece and clamp if necessary to prevent movement. Insert the bit into the drill chuck or holder and tighten firmly. Use a steady feed rate and moderate drilling speed appropriate for the material: higher speeds for plastics and lower speeds for thicker or tougher metals. Apply cutting fluid when drilling metal to reduce heat and extend tool life, and periodically withdraw the bit to clear chips during deep holes.

Recommendations

For best results, match drill speed and feed to the work material, use proper clamping, and keep bits sharp. Replace bits that show excessive wear, chipping, or loss of concentricity to maintain hole quality and safe operation.