The Drill Doctor spade and twist bit sharpener is a versatile multifunction tool that can sharpen nearly every bit in your shop. It sharpens spade bits up to 1 1/2in. and twist drills up to 1/2in. in less than a minute. Utilizes a precision alignment system to produce consistent results, time after time. U.S.A. Bit Sizes (SAE): Spade: 1/4in.-1 1/2in; Twist: 3/32in.-1/2in., Cobalt Bits: Yes, Case Included: No, Masonry Bits: Yes, Split Point Bits: Yes, Titanium-coated Bits: Yes, Angle Sharpening (deg.): 118, Carbide-Tip Bits: Yes, High Speed Steel Bits: Yes