REESE Towpower 72783 Universal Coupler Lock, Adjustable Storage Security, Heavy-Duty Steel DIMENSIONS: 9 x 9 x 3 BUILT TO LAST: The REESE Towpower Universal Coupler lock is a premium lock constructed with an aluminum body and heavy-duty steel lock bar. UNIVERSAL FIT: Ratchet design is adjustable with 11 locking positions and fits 1-, 2, and 2-5/16 couplers. DETERS THEFT: Bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers. SECURE PROTECTION: Easy-to-install lock resists picking, prying and drill outs. Guards against truck or trailer towaway theft in storage.