Provides protection against theft for boat trailer
High quality, through-hardened steel
Triple-nickel chrome plating
Guaranteed not to rust, chip, or peel
Reliable Security With Great Looks. McGard wheel locks provide the best protection against theft for boat trailers with steel or alloy wheels. Simply replace one of the lug nuts with a McGard wheel lock - that's it! Made from high quality, through-hardened steel with triple-nickel chrome plating. Guaranteed not to rust, chip, or peel for life. 1/2 x 20 thread.