Trimax Premium Universal Dual Purpose Coupler Lock One Size. Ballistic Grade Nylon housing absorbs hammer blows and protects against severe weather. The key hole cover slides up to seal out dirt. The UMAX100 Dual Purpose Coupler Lock features a huge 7-tooth 3/8" wide locking lug system. Provides 360 of "solid hardened steel" protection. For dual force security pair with Trimax chains and cables. Fits most couplers (1-7/8" 2" to 2-5/16"). Includes two round keys. Specifications for Trimax Premium Universal Dual Purpose Coupler Lock: Manufacturer: Trimax Color: Black/Silver Fabric/Material: Nylon Features of Trimax Premium Universal Dual Purpose Coupler Lock: One size fits most coupler types Dual ratchet lock system Exclusive design provides 360 degrees of hardened steel protection Key hole cover keeps out dirt Attractive ballistic grade nylon housing Hardened 5/8" steel shackle Hardened steel cross bar and ball Package Contents: Trimax Premium Universal Dual Purpose Coupler Lock Trimax UMAX100: Premium Universal Dual Purpose Coupler Lock One Size