Drum bolt and lugs, along with washers and nuts are all made of high-grade steel with galvanization. They are corrosion resistant, does not weaken, rust or wear out from exposure to weather. This kit includes lock washers to keep the installation secure over a long time. Installed easily with adjustable wrench. Drum locking bolt M8, M10, M12 and 3/8’’, 5/8’’ are for different volumes of drums.