Receiver/Coupler Lock Lock Type Barbell Hole Dia. 1/2 In. and 5/8 In. For Use With Popular Branded Trailer Receivers Automotive and Towing Trailers Vans and Moving Trucks Marine Recreation Features Features: Fits Both 1/2 and 5/8 Receivers Stainless Steel keyed alike receiver lock and coupler latch lock 5/8 Receiver lock has Push to Lock(TM) locking mechanism- push lock body onto pin firmly and remove key Weather Tough(R) seal and water tight cap protects lock from moisture and dirt Adjustable coupler latch lock; locks from9/16 to 2-3/4 K1 Key Blank Item: Receiver/Coupler Lock Lock Type: Barbell Hole Dia.: 1/2 and 5/8