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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. Standard length. Includes sizes: 3/8", 1/2", 5/8", 3/4", 7/8", and 1".