The Tusk Crush Washer Kit is a great addition to any garage or toolbox. Most manufacturers recommend replacing sealing crush washers at each oil or coolant change. The Tusk kit contains five of the most common sizes for motorcycles, ATVs, and UTVs: M6, M8, M10, M12 crush washers, and M10 washers for banjo bolts. The washers come in a clear, organized case. They are made of a soft tempered aluminum that crompreses to seal in fluids.