Sharpen the most common drill bits in under a minute using an easy 3-step sharpening system that makes everyone a drill sharpening expert. The Darex V390 sharpens drill bits 1/8in.-3/4in. (3-19mm) and 118deg to 140deg with ease. U.S.A. Bit Sizes (SAE): 1/8 to 3/4, Bit Sizes (mm): 3 to 19, Angle Sharpening (deg.): 118 to 140, Cobalt Bits: Yes