Accessories The set includes 4pc chainsaw whistles, used with a sharpener, provide a quick and easy method of sharpening the saw chain. Material Made of high quality material, not easily broken, anti-aging, durable and corrosion resistant, can be used for a long time. The assembly Easy to install, install the grinding wheel back into the black fittings, put it back into the utensil of grinding chain, no tools required. Use Just put the chain and saw into the chain cutter, put the front end on the sharpening stones, then turn on the chainsaw, easy to operate. Great range for home, woodworking, home renovations, factory, construction engineering and so on. Specification: Grinding / slicing diameter: 115 (mm) Note: 1. Due to manual measurement, there may be little deviations. 2. Sharpening stones only, other items not included! Package: 4 x Whetstone