Bosch Drill Bit Set T4042 42 Piece Mixed Impact Tough (1 4 Inch Hex Shank High Performance Tool Steel Driving and Drilling Professional Kit) Forstner Bits superior quality cuts in hardened superior quality cuts in hardened materials Engineered with a high contrast backlit graphic display and a two button control layout Brand Bosch Model Number T4042 Total Piece Count 42 Pieces Shank Type 1 4 Inch Hex Round Bit Material High Performance Tool Steel Impact Rated Yes Storage Case Type Hard Shell Portable Application Range Drilling and Driving Tool Compatibility Standard Drills & Impact Drivers Measurement System Imperial (SAE) Pro Tip: To prevent premature fastener wear or bit stripping in high torque applications High Grade Tool Steel: Premium steel alloy construction provides exceptional resistance to shear forces and tip wear during repetitive daily applications