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For boat trailers with steel or alloy wheels, simply replace one of the lug nuts with wheel lock. machined from high quality steel, through-hardened and then triple-nickel chrome plated. every mcgard lug nut is guaranteed for life not to rust, chip or peel.most o.e.m. trailer wheels use 1/2" - 20 cone seat lug nuts and locks. check with trailer manufacturer for proper thread size and seating type.
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