Drill Bit Sharpener Sharpens 3/32-in to 1/2-in standard-twist bits Optional 1/2-in to 3/4-in large bit chuck (available separately) Sharpens High-Speed Steel, Masonry, Carbide, Cobalt, TiN-coated, and Split-Point Bits NEW One-piece alignment system improves precision, and adjustability Drill Doctor Drill Bit Sharpener