Master Lock 1481DAT Stainless Steel Barbell Receiver and Adjustable Coupler Lock Set Stainless steel keyed alike receiver lock and coupler latch lock 5/8 inch receiver lock has Push to Lock locking mechanism push lock body onto pin firmly and remove key Usable length of receiver pin is 2-3/4 inch Weather tough seal and water tight cap protects lock from moisture Adjustable coupler latch lock, locks from 9/16 inch to 2-3/4 inch