Stark Usa Industrial Cobalt Uni Step Bits Spiral Flutedrill Bit Set 31014 5PC or 31012 9PC

31014-5PC Cobalt Steel Bits Provide Longer Life & Cut Faster Than High Speed Steel Two Sprial Flutes, Automatically Deburrs As You Drill & Provides Better Chip Rem Tri-Flat Shank For Sure Grip, 135 Degree Split Point, Self Centering 1/4" Shank: 3/16" To 1/2", 6 Steps 1/4" Shank: 1/8" To 1/2", 13 Steps 3/8" Shank: 1/4" To 3/4", 9 Steps 3/8" Shank: 1/4" To 1-3/8", 10 Steps 3/8" Shank: 3/16" To 7/8", 12 StepsHardness HRC 66, M35 31012-9PC Manufactured With Heat Treated HSSCoated With Titanium Nitride, Two Flute DesigFor Drilling Holes in Thin Material Such as Steel, Stainless Steel, Copper, AlumTri-Flat Shank For Sure GripBlack & Cobalt Surface TreatmentHolds Lubricant For Smoother DrillingFlute Shape Straight FluteMaterial Titanium Nitride Coated (HSS)Quick Change Shank 1/4"13 Steps 1/8" - 1/2" in 1/32 Increment6 Steps 3/16" - 1/2" in 1/16 Increment9 Steps 1/4" - 1" in 1/16 Increment12 Steps 3/16" - 3/4" in 1/16 Increment8 Steps 9/16" - 1" in 1/16 Increment10 Steps 13/16" - 1-3/8" in 1/16 Increment12 Steps 7/16" - 1-1/8" in 1/16 Increment10 Steps 1/4" - 1-3/8" in 1/8 Increment13 Steps 1/8" - 7/8" in 1/16 IncrementPackage Contents 9pc Step Drill Bit, Storage Case