5/8" (16mm) diameter

This 5/8" receiver lock by Andersen Premier Towing Products is made of stainless steel and features a triple ball bearing mechanism to help eliminate seizing. The Click-Lock system securely locks with one push and then releases the key. Works with Class III-V 2" or 2 1/2" receivers. 

Stainless Steel Receiver Lock -fits 2", 2-1/2" and oversized receivers.

• 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)
• 2 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: 3-1/2" x 5/8" (inside shank)