Master Lock 2866DAT Fits 1/2 in. and 5/8 in. Receivers Trailer Hitch Lock Locking hitch pin fits 1/2 in. (13 mm) and 5/8 in. (16 mm) receivers; usable length of each chrome hitch pin lock is 2-3/4 in. (70 mm) 1/2 in. trailer hitch locking pin is rated up to 3,500 lbs (Class I and II), 5/8 in. trailer hitch locking pin is rated up to 10,000 lbs (Class III and IV) Locking head rotates 360 degrees allowing keyway to conveniently face forward; receiver lock features push-to-lock locking mechanism to ensure a secure lock every time; Push head firmly onto the pin and remove key Snap-on cover provides weather resistance and prevents dirt and moisture from entering keyway, four-pin cylinder for added security to prevent lock picking Receiver lock provides added security and theft deterrence while towing