TRIMAX has spent the last 10 years expanding and improving on the "ORIGINAL" trailer locking pins. A 1/4 turn of the rugged tube key locks & unlocks the strongest locking pin on the market. This locking hitch pin features solid hardened steel construction and a built-in keyed lock with a weatherproof cap. Don't settle for low quality knockoffs! The removable sleeve allows this locking hitch pin to fit all 1-1/4" and 2" Class 1, 2, 3 and 4 trailer hitches with the standard 1/2" or 5/8" hitch pin hole. The Patented Dual Lock Lug Design offers over 5,800 Lbs of head pull strength.