Bosch Impact Tough drill bits with 1/4-Inch hex shank are ground from a single piece of tool steel. The Uni-body Built design gives users 3-times longer life vs standard 2-piece drill bit and 1/4-Inch hex shank designs in impact drivers. Bosch Impact Tough drill bits also feature a 135-degree split point tip for less walking and all bits are finished with a black oxide coating to protect against heat buildup. The Bosch IMD5007 7-piece set comes packed in a reusable clamshell that folds in half to easily remove and replace the drill bits. Set Includes: 1/8-Inch, 5/32-Inch, 3/16-Inch, 7/32-Inch, 1/4-Inch, 5/16-Inch, and 3/8-Inch diameter bits.