Master Lock Stainless Steel barbell style receiver lock features a Swivel Head™ design for easy access when locking and unlocking Extended length shackle (3-1/8 wide) that fits wider receivers for late model trucks including: * Ford F-350 * Toyota Tundra * GM Silverado & Sierra and trucks equipped with HD towing packages The barbell receiver lock has hardened receiver pins for increased sheer strength and a precision 4-pin tumbler locking mechanism resists picking Stainless steel locking head with a covered key way offers ultimate corrosion resistance and protection from moisture, dirt, and grime Fits 5/8 receiver holes.