When you need a reliable lockset to secure your trailer coupler look no further than Draw-Tite Heavy-Duty Universal Gorilla Guard Trailer Coupler Security Lock. Designed to fit most 2 5/16-inch trailer couplers this useful set secures your trailer and protects it from theft.Easy to install this coupler lock works with couplers that have a total width (including the lip) of 4 1/8 inches and a coupler lip with a maximum height of 5/16 inches. To start put the lock into your trailer tongue and outthrow the latch. Push the lock pin down through the lock securing it so it doesn t allow the latch to come back up and prevents anyone from hooking on to the trailer tongue. This set comes complete with a gorilla guard trailer coupler lock with 2 security key for ease of use.Designed using state-of-the-art technology with customers in mind the Draw-Tite Heavy-Duty Universal Gorilla Guard Trailer Coupler Security Lock is ideal to make trailer towing safer and easier. Crafted with high-quality materials this coupler lock lasts for years to come and is guaranteed to meet the highest standards of quality and durability.