The Trimax T5 Receiver Lock is designed with a wider 3-1/2" span to fit Class V Hitches. The 5/8" pin fits all Class III, IV, and V receivers. An exclusive internal O-ring and watertight cap help seal out dirt. This lock comes with two round keys that won't bend or break.• 5/8" pin with 3-1/2" insert span fits all class III, IV, and V receivers• Solid hardened steel pin• Rust-proof aluminum head• Internal O-ring and watertight cap to seal out dirt• 1/4 turn locks and unlocks head• Lock head can't be false locked or pop open• Includes 2 round keys Internal O-ring & watertight cap seal out dirt Includes 2 round keys with easy 1/4 turn lock & unlock | Trimax Class V Receiver Lock, 3-1/2" Span