Diamond Chainsaw Sharpener with Guide Fits into your normal cordless drill. Enables precision sharpening the chain in place on bar. The shafts are precisely sized and will not reduce or distort. The precision guide controls depth of cut and angle. Hook angle will remain the same on each cutter. Sharpens all teeth including carbide, HSS, with a 1/10th of the force required with normal stones. No sparks, no shatter and no burning of the cutting edge. Lasts twenty times the life of files and stones. Chains will cut longer between sharpening.