The Drill DoctorÆ DD350X is a value-priced and easy-to-use drill bit sharpener, ideal for the shop that uses the most common bit styles and works mainly in wood and light metals. U.S.A. Bit Sizes (SAE): 3/32 to 1/2, Angle Sharpening (deg.): 118, Carbide-Tip Bits: Yes, High Speed Steel Bits: Yes, Masonry Bits: Yes, Titanium-coated Bits: Yes Easy front-loading chuck Simplified alignment and sharpening procedures Replaceable diamond sharpening wheel Model DD350X