This REESE Towpower Heavy Duty universal coupler lock prevents theft and keeps your trailer secure. The bright, silver color is highly visible and deters thieves. It features a ratchet design with six locking positions for versatility, and is designed to fit 1-7/8 In., 2 In., and 2-5/16 In. couplers. 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. Dimensions: 3.1 L x 7.9 W x 8 H Inches (Shipping Dimensions)