The Reese Towpower Professional Series Dogbone Receiver Lock is designed for maximum anti-theft security. Featuring a ball bearing locking system for superior security and a pick proof square key design that deters theft. This lock has a 3-1/2" span, a 5/8" pin diameter and fits most 2-1/2" Class V receiver openings. REESE is the market leader in automotive and recreational product solutions, engineered and designed to meet the demands for work and active lifestyles. REESE Towpower pioneered the technology that has set the standard for today's most advanced towing systems. We cater to the towing needs of everyone from recreation enthusiasts to heavy-duty agriculture users by manufacturing the largest selection of receiver hitches; ball mounts and hitch balls; trailer and hitch locks; couplers, jacks and winches; and electrical and lighting components that meet and exceed industry standards.