Universal Size: This ball hitch lock features a universal fit for 2-5/16 in couplers, meeting the needs of multiple trailers. Please confirm your coupler size before purchase to ensure the lock matches your trailer Multiple Protections: Crafted from an aluminum alloy body, this trailer hitch lock withstands impact and tampering for long-term stable use. The zinc alloy core structure avoids prying, and the included padlock provides extra protection Rust-Resistant Durability: This trailer locks ball hitch features the electrophoresis and powder coating surface with rust and corrosion resistance. It can maintain stable performance and a new finish under scorching sun, heavy rain, or freezing snow Easy Operation: Our trailer ball lock operation requires no tools. You just need to insert the lock body into the coupler, adjust it to the right position, and use the keys to lock or unlock quickly