Featuring patented BOLT Breakthrough One-Key Lock Technology, the BOLT Receiver Hitch Lock works with your vehicle ignition key. Use the BOLT Receiver Hitch Lock to secure your hitch to your truck and never worry about losing or having to remember which key goes to your receiver lock again. Available with 5/8" diameter pin, the BOLT Receiver Hitch Lock is suitable for Class 3, 4, 5 towing applications. Featuring an automotive grade lock cylinder and a stainless steel lock shutter and cap to keep out dirt and moisture, each BOLT Receiver Lock comes with a solid stainless steel pin and a weather-resistant jacket ensuring the long life of your lock.• Opens with your vehicle's ignition key eliminating extra keys on your ring• Works with Ford, Lincoln, and Mercury keys• Stainless steel 5/8" diameter pin for use with Class 3, 4, and 5 hitches (2 to 2.5" receiver)• Auto-return spring locks automatically when key is removed• Stainless steel lock shutter to keep out dirt and moisture• Plate tumbler sidebar to prevent picking and bumping• Double ball bearing locking mechanism Automotive-grade lock cylinder Stainless steel lock shutter and cap to keep out dirt and moisture Auto-return spring locks automatically when key is removed | BOLT 5/8" Receiver Lock for Ford, Lincoln, Mercury Standard Cut Keys