Drill America DWD13J-CO-SET 13 Pc Cobalt Drill Bit Set 1/16" - 1/4" Slip / Groove Joint Crowned alloy steel striking face

Crowned alloy steel striking face with uniform beveled edges and one spherical striking face

Universal spline drive compatible with multiple fastener types in both SAE and Metric sizes

so this feature should only be used when needed

and metal hinge pins

Drill America DWD13J-CO-SET 13 Pc Cobalt Drill Bit Set 1/16" - 1/4" Slip / Groove Joint Crowned alloy steel striking faceDrill America DWD13J CO SET 13 Pc Cobalt Drill Bit Set 1 16" 1 4" Features: Set of 13 jobber length drill bits includes inch sizes 1 16" to 1 4" in 1 64" increments Cobalt steel provides extended tool life compared to high speed steel drill bits when drilling hard materials Gold oxide finish lubricates the drill bit and provides wear resistance Self centering 135 degree split point penetrates hard material without a pilot hole and produces small chips