Trimax TH6 5/8" x 6-1/8" Diameter Premium Swing Away Trailer Lock 5/8 inches pin fits class III, IV and V hitches Patented design, incorporates O-ring and water tight cap to help seal out dirt and corrosion Strongest locking pin on the market Large dual lock lugs prevent false locking and lock can't pop open Rugged key won't bend or break