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′.