Irwin 88820 Speedbor 1-1/4-Inch by 6-Inch Spade Drill Bit Blue-Groove drill bit point and cutting edge for fast chip removal Wood drill bit uses double-cutting spurs that scribe the outside of the hole, reducing breakout Flat drill bit features a large shank for added durability Grooved hex shank helps prevent slipping in the drill chuck or bit extension Fits most standard quick-change chucks 1-1/4" diameter and 6" long Micro-groove point and cutting edges with extended spurs for faster, cleaner boring action Forged in one piece from Irwin's own special grade tool steel Heat-treated full length for extra overall strength For 1/4" and larger electric drills