The Milwaukee® RED HELIX™ 29-piece cobalt drill bit set is engineered for extreme durability and longer life in hard metal applications. The Milwaukee® cobalt drill bits are designed with a VARIABLE HELIX™ that includes an aggressive 35 deg helix angle which ends at 15 deg. The drill bits have QUADEDGE TIP™ to decrease heat build up and drill faster. The 135 deg split point tip delivers a precision start and prevents walking for fast, accurate holes in hard metal, PVC and wood. The tapered drill bits feature a new ENHANCED TAPERED WEB™ that strengthens the bit's core to increase flute durability. The cobalt twist drill bits are ideal for tough applications, providing up to 15X life vs. black oxide Drill Bits™. This set includes 29 bits from 1/16 to 1/2 in.