BIT DRILL COBALT KIT 15PC an aggressive 35 Helix Angle which ends at 15 , the Cobalt bits with Red Helix provide rapid Chip Removal limiting heat build-up to stay sharper longer. 135 split point for precision start no walking. Chip Breaker decreases heat build-up. Secure Grip prevents bit from slipping in chuck. The set contains (1) 1/16" Cobalt Red Helix drill bit, (1) 5/64" Cobalt Red Helix drill bit, (1) 3/32" Cobalt Red Helix drill bit, (1) 7/64 Cobalt Red Helix drill bit, (2) 1/8" Cobalt Red Helix drill bit, (1) 9/64" Cobalt Red Helix drill bit, (1) 5/32" Milwaukee Thunderbolt Cobalt drill bit, (1) 3/16" Cobalt Red Helix, (1)7/32" Cobalt Red Helix, (2) 1/4" Cobalt Red Helix, (1) 5/16" Milwaukee Thunderbolt Cobalt drill bit, (1)3/8" Cobalt Red Helix, (1) 1/2" Milwaukee Thunderbolt Cobalt drill bit and case.