TRIMAX is the Leader in trailer hitch locking pins has spent the last 10 years expanding and improving on the "ORIGINAL". This locking hitch pin features solid hardened steel construction and a built-in keyed lock with a weatherproof cap. The Patented Dual Lock Lug Design offers over 5,800 Lbs of head pull strength. A 1/4 turn of the rugged tube key locks & unlocks the strongest locking pin on the market. Don't settle for low quality knockoffs! This locking hitch pin fits all 1-1/4" Class 1 and Class 2 trailer hitches with the standard 1/2" hitch pin hole.