13pc Quick change Cobalt Drill Bit Set Hex Shank Drill Bit Set Power BITS - Great additional To Complete a Missing Bit Set 2 flutes form helps clear chips and debris away from the bit, decreasing friction and heat for a faster, cooler drilling process. 1/4 inch hex shank fits into all power tools more easily and securely, specially for locking into quick change chuck. SPECIFICATIONS: Quick change 1/4" Hex shank Professional high quality - Cobalt Drill Bits for Quick Change 1/4" Hex shank Built Specifically For Longer Lasting than Standard Bit Sets Sizes Included: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4"