Set Includes: 4 bolts, 4 washers, 1 L-type wrench, Washer = diameter 0.7 inch (18 mm) thick 0.1 inch (3 mm) bolt = M6 size total length 0.8 inch (20 mm) bolts are made of SUS304 for excellent heat and corrosion resistance. When installed, the head of the aluminum washers and bolts are slick. We hope you can dress it up or customize it.