Made from stainless steel with aluminum heads. 99.99% rust-free materials. Receiver pin fits all standard 2" and 2-1/2" receivers. Over 30,000 lbs shear strength. Triple ball bearing and cam-style locking mechanism. Clik-Lock system securely locks with one push (no 'false' locks). Two heavy-duty keys (keyed alike and reversible). Rubber dust cap protects key slot from liquids and other grime. Provide 24/7 security for your hitch mounted accessories. Dimensions: Adjuster pin 4-3/8" x 5/8" (inside shank), Receiver pin 3-1/2" x 5/8" (inside shank).