The Trimax SXTC3 Stainless Steel Coupler Lock fits couplers with up to 3-1/2" span. An exclusive internal O-ring and watertight cap help seal out moisture. This lock comes with two round keys that won't bend or break.• Fits couplers with up to a 3-1/2" span• 1/4" pin diameter• 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 2 round keys Made of 100% stainless steel Includes 2 round keys with easy 1/4 turn lock & unlock | Trimax Stainless Steel Coupler Lock, 3-1/2" Span