Irwin 87908 Spade Drill Bit 1/2 in Dia 4 in OAL Flat Flute 1/4 in Dia Shank Hex Shank

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 and fits all standard quick change chucks.