ITEM NAME:5/8" RV Trailer Hitch Pin Lock fit for 2"x2" Towing Receivers Tube MIC-HL-227C 5/8" RV Trailer Hitch Pin Lock for 2"x2" Towing Receivers Tube with 2 Keys SPECIFICATIONS.(5/8" RV Trailer Hitch Pin Lock for 2"x2" Towing Receivers Tube with 2 Keys. 5) Like a hitch pin and clip, MICTUNING hitch lock is designed to insert into the fastener hole in the side of a receiver tube in order to hold a ball mount or hitch-mounted accessory in place.