Accessories Set includes 4 pc chainsaw whistles, used with sharpener, provide a quick and easy method of sharpening the saw chain. Material Made of high quality materials quality, 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, place it from new in grinding chain utensil, no tools required. Use Just put the chain and saw into the chain cutter, place 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. The set includes 4pc chainsaw whistles, used with a sharpener, provide a quick and easy saw chain sharpening method. Made of high quality material, not easily broken, anti-aging, durable and corrosion resistant, can be used for a long time. Easy to install, install the grinding wheel back into the black fittings, put it back into the grinding chain utensil, no tools required. 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 for home, woodworking, home renovations, factory, construction engineering and so on. Specification: Size: 59 x 17 x 13 mm / 2.32 x 0.67 x 0.51 inch Note: 1. Due to manual measurement, there may be a little deviation. 2. Sharpening stones only, other items are not included Package: 4 x Whetstone