Drill D109 SM3 Set 25Pce JBR HD Cobalt S/Pt 1.0-13.0x0.5mmP N D109 SM3 Sutton Tools Heavy Duty Cobalt jobber drills are industrial quality for drilling materials that have high hardness and tensile strength such as cast iron, bronze, hard steel & stainless steel. These drill bits feature a thick core for increased rigidity in hard materials. 135 split point (drills > 2mm & 3 32) enables accurate positioning and less drilling pressure Thick core for increased rigidity in hard materials Precision engineered