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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., Angle Sharpening (deg.): 118, Carbide-Tip Bits: Yes, Cobalt Bits: Yes, High Speed Steel Bits: Yes, Masonry Bits: Yes, Split Point Bits: Yes, Titanium-coated Bits: Yes, Case Included: No Sharpens both twist and spade bits in under a minute Sharpens spade bits from 1/4in.-1 1/2in., including bits with or without spurs, screw points, skew cutters and small spear point bit Sharpens twist drills from 3/32in.-1/2in. to a standard 118° point Sharpens high speed steel, titanium-coated, masonry and cobalt twist drill bits Sharpening modules feature precision alignment systems to ensure ease of use and repeatable results Uses replaceable diamond grinding wheel to sharpen twist bits Uses cool-running profiled vitrified wheel to sharpen spade bits Includes quick-start guide and instructional DVD