Bosch 2608594254 HSS-G Hole Saw Pilot Drill 7.15mm x 43mm x 85mm 1/4in Hex Shank The Bosch 2608594254 has a 1/4 Inch Hex Shank, a 7.15mm diameter and a working length of 43mm. The Pilot Drill Bit drills the pilot hole in order to guide the hole saw into position. Use this pilot bit when cutting holes through a wide variety of materials including: Wood, Drywall, Plastics, Metal, Non-Ferrous Metal and Stainless Steel. Features: 3x higher speed and lifetime due to its tip design HSS G delivers more robustness and precision than its predecessor Pilot Drill Bit drills the pilot hole in order to guide the hole saw into position Pilot bit cuts holes through a wide variety of materials Specification: Diameter: 7.15mm Working Length: 43mm Overall Length: 85mm  Shank: 1/4in