CZC AUTO Trailer Hitch Coupler Locking Pin's Design. 1/4 inch diameter 2 pack black tongue lock pin with 2-1/2 inch effective length. Please verify the size before purchasing our trailer hitch coupler pin lock 1/4 inch. | Application of the 2 pack 1/4 Inch Trailer Pin Lock. The keys of 2 pack are the same. Fits latch-type couplers for towing boat truck RV car. The watertight rubber cap keeps rain, snow, ice and dirt out. Kinds of weather can be handled. | Security of Our Coupler Locking Pin. Made of high-strength steel and coated with black electrophoretic paint, the 1/4 inch trailer coupler locks 2 pack are good at detering theft and preventing corrosion. Zinc alloy tubular lock core and more solid round key also help to improve security of the black coupler lock. | Easy to Operate Coupler Latch Lock. Our 1/4 inch trailer tongue lock 2 pack push-to-lock design without key, after hearing "click", you just need to pull the lock head to ensure it is working. 1/4 turn the key to open the coupler pin lock, the pin will pops-up automatically and comfortably. | CZC AUTO - Reliable Brand in Towing Sercurity Industry. We offer 30-day money-back for any reason, 12-month warranty for quality-related issues. Any issue in using our 2 pack trailer hitch coupler lock, simply contact us, your problem will be solved within 24 HOURS.