5/8″, Barbell Receiver Pin & Coupler Lock, Stainless Steel Sleeve, Straight Barbell Style Pin Provides Function & Protection In 1 Unit, All Weather Cap Protects Key Way From The Harsh Elements, Coupler Pin & Lock Provides The Same Function & Protection With Keyed Alike Lock To Secure Your Trailer Coupler In The Locked Position, Coupler Latch, 7/8″ Width, Also Has Weather Proof Cap To Keep Keyway Safe From The Elements, K1 Key Way.