Spade Bit Set Contents: 3/8", 1/2", 5/8", 3/4" & 1" Spade Bits, with 6" Quick Change 6" Shank Length. 1/4" Shank Size Blue-Groove point and cutting edge for faster chip removal - 4x faster than standard spade bits Double cutting spurs scribe the outside of the hole reducing breakout 10% larger shank for added durability Grooved hex shank prevents slipping in drill chuck or bit extension Fits all standard quick change chucks