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 Engineered with a high contrast backlit Engineered with a high contrast backlit graphic display and a two button control layout Featuring the GTB18V 45 1 4 inch hex screwgun with XTEND DRIVE™ technology 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 Precision Ground Tip Geometry: Optimized bit profiles engage fastener heads with maximum surface area contact to drastically reduce slippage and cam out