Enjoy instant security for your boat, camper or utility trailer when it's not hooked up to your vehicle. The universal design locks solidly to any brand of trailer coupler. The 5/8" steel shackle is anchored by a six-tooth, 3/8" dual-ratchet locking mechanism. Its 1/2-turn technology ensures positive lock engagement. The spring-loaded, seven-pin, high-security key system is built for years of reliable use. Sliding keyhole cover. Rust-resistant finish. Fits 1-7/8", 2" and 2-5/16" couplers.