Slicing Edge Sharpening System - CW1 Charlie's Wheel Slicing Edge Sharpening System. Contains sharpening wheel and polishing wheel made to fit any 1/2 shaft bench grinder. Use these wheels to put a professional quality, razor sharp, burr-free edge on your cutlery. Each 8" x 3/4" wheel will sharpen 300-400 knives before requiring reconditioning. Includes one CW-2. Easy to use. Grinder not included."