Super hard coating reduces friction and heat build-up, lasts longer than standard drills. Surface drills cooler, lessens torque and downward drilling pressure. All sizes 3/16" and larger have 3 flats on the shank for a better grip on the drill bit. All sizes 13/32" and above have a 3/8" reduced shank. The 135 degree split point eliminates the need for a center punch and keeps the drill from skating on the hard materials. Includes (1) one each: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/16", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8" and metal case with pilfer proof tab.
