Irwin Speedbor 8-Piece Spade Bit Set

Blue-Groove point and cutting edge for faster chip removal. 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. Includes Pro Set case made of molded ABS resin with full-length metal hinge pin. Bit identification is simple with easy-to-read size markings. 6' shank length, 1/4' shank size. Set includes: 3/8', 1/2', 5/8', 3/4', 7/8', 1', 1-1/8', and 1-1/2'.