McGard wheel locks & lug nuts for boat trailers are machined from high quality steel, through-hardened and then triple-nickel chrome plated. For boat trailers with steel or alloy wheels with cone seats, simply replace one of the lug nuts with a McGard wheel lock, that's it. Our wheel locks and lug nuts are 1/2"-20 cone seat. Note, most OEM trailer wheels use 1/2"-20 cone seat lug nuts. Skin packaged.
Please be sure to verify your thread size prior to ordering. See the MORE PHOTOS link for thread sizes of the McGard products.