Master Lock Trailer Lock, Trailer Coupler & Receiver Lock Combo Pack, 3794DAT LOCK APPLICATION: Best used for vehicles, trailers, and RV hitch locks EASE OF USE: Receiver lock features convenient Push to Lock locking mechanism: push lock body firmly onto the pin and remove key DURABLE DESIGN: Weather Tough seal and watertight cap provide protection from moisture and dirt SPECIFICATIONS: Stainless steel trailer coupler lock adjusts from 9/16 in. to 2-3/4 in.; Fits 1-7/8 in., 2 in. and most 2-5/16 in. couplers INCLUDES: One trailer coupler lock, one receiver lock, one trailer coupler latch lock; two keys (both keys open all three locks)