The Trimax SXTM33 Receiver Coupler Lock Set includes a 5/8" Receiver Lock with 2-3/4" span that fits all 2" Class III, IV, and V receiver hitches. This set also comes with a Coupler Lock that fits couplers with up to a 3-1/2" span. Constructed with machine-forged stainless steel, these locks feature internal O-ring and weather-resistant rubber cap to help keep water, grime, and dirt out of the locking mechanism. This lock set comes with four keyed-alike round keys that won't bend or break.• 5/8" pin fits Class III, IV, and V receiver hitches• Fits 2-3/4" span• Fits couplers with up to 3-1/2" span• Made of stainless steel• Internal O-ring and watertight cap to seal out moisture• 1/4 turn locks and unlocks head• Lock head can't be false locked or pop open• Includes 4 keyed-alike round keys Internal O-ring & watertight cap seal out moisture Made of 100% stainless steel Includes 4 keyed-alike round keys with easy 1/4 turn lock & unlock | Trimax Keyed-Alike Receiver Coupler Lock Set, 1/2" - 5/8" x 2-3/4" Receiver and 3-1/2" Span Coupler