Maximum Security 5/8 inch Long Span Chrome Plated Hitch Pin Lock with 2 Round Tube Keys - Diversi-Tech's Hitch Pin locks are made from hi tensile strength forged alloy steel and chrome plated to prevent rusting and provide years of good looks. This 5/8 inch long span, chrome-plated, forged steel, tube-style hitch lock is used to secure your ball mount to your 2-1/2 inch receiver. It has an easy one-quarter turn operation and a lock with a water-tight cap that keeps the water out of the lock to prevent corrosion. Has a high strength ball interlock design that prevents false locking. Includes 2 round tube keys. Limited Lifetime Warranty. Pin diameter dimensions approx. 5/8 inch (for use on 2-1/2 inch x 2-1/2 inch receivers). Pin Length dimensions approx. 3-1/4 inch. Overall Length dimensions approx. 6-1/4 inch. 1 per package. **Note: Some 2-1/2" receivers are too wide for this lock. Draw-Tite and Reese brand Titan hitches with an 18,000 lb towing capacity and 2010 or newer GM Heavy-Duty 2-1/2 inch receivers are too wide for this lock. The lock will not fit these receivers.**