Overview Reviews Product Description Precision ground 82-degree tip for countersinking most machinable metals, wood or plastic.Made from industrial grade high-speed steel for increased durability.Black oxide finish resists corrosion.Five-flute design reduces vibration for smoother drilling and extended life.1/4-inch round shank fits all handheld and stationary drills. Irwin Tools Catalog Product Videos Custom Field Manufacturing country CN Product Reviews Write a Review Write a Review × Irwin 1/2" 82° High Speed Steel Countersink Bit 12411 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *