This Bosch EXPERT Self Cut Speed Flat Drill Bit is the 40mm diameter variant, 152mm in length — the largest size in the range and the right choice for heavy-duty installation tasks requiring a wide, clean bore through softwood, including large-diameter pipes, ducting entry points, and substantial cable routes. Up to 3x faster than the Bosch 2609255269 Spade Bit, the 40mm variant is built for the most demanding professional applications. Bosch Tip Technology drives the self-feeding threaded tip into the material with minimal operator pressure, ensuring smooth progress even at this wider cutting diameter and in physically challenging positions overhead or within tight voids. The wave-shaped paddle design delivers rapid cutting performance and efficient chip clearance throughout the full bore depth. The 1/4″ impact-rated hex shank provides secure, vibration-resistant fitment in both impact drivers and drill drivers. Features and Benefits: • Up to 3x faster than Bosch 2609255269 Spade Bit • Self-feeding threaded tip for minimal-pressure boring at large diameters • Wave-shaped spade design for fast, clean cutting and efficient chip removal • 1/4″ impact-rated hex shank — compatible with impact drivers and drill drivers • Ideal for large-diameter pipes, ducting, and heavy cable routes in softwood Specifications: Cutting Diameter: 40mm Length: 152mm