Each of these 115 cobalt drill bits comes organized in a metal indexed storage case for easy transport to your work site. With aggressive 135 degree tips, these cobalt drills bits not only last longer but also cut faster than your standard high speed steel bits! This set contains numbered bits: 1-60, lettered bits A-Z, and fractional bits 1/16-1/2 by 64ths. All bits are cobalt jobber length drill bits.