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 either a 1/2" or 5/8" diameter pin the BOLT Receiver Hitch Lock is suitable for Class 1-5 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.