IRWIN 88886 Standard Spade Bit Set, HSS, 6-Piece, For Standard Quick-Change Chucks                 Blue-Groove point and cutting edge for faster chip removal, double cutting spurs scribe the outside of the hole reducing breakout. Grooved hex shank prevents slipping in drill chuck or bit extension, fits all standard quick change chucks. Includes one of each 3/8 in, 1/2 in, 5/8 in, 3/4 in, 7/8 in and 1 in. All are 6 in long standard length drill bits.