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. 4" shank length, 1/4" shank size. Includes sizes: 1/2", 3/4", and 1".