Overview Reviews Product Description High speed steel with black oxide coating for corrosion resistance.5 flute design reduces vibration for smoother drilling.Precision-ground 82 deg (degree) tip for countersinking into most machin able metals.1/4" round shank compatible with all hand held and stationary drills. Irwin Tools Catalog Product Videos Custom Field Manufacturing country CN Product Reviews Write a Review Write a Review × Irwin 5/8" 82° High Speed Steel Countersink Bit 12412 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *