WINCH STOPPER FUNCTION: The rubber stopper can reduce the bounce, wear, and rattling of the winch rope recovery, It also keeps tension on the hook to prevent the cable from loosening, enhance safety and prevent accidents or disasters that could occur if the cable fails or is damaged during operation DURABLE MATERIAL: Nilight Winch Stopper is made of premium quality rubber, which is waterproof, wear-resistant, resilient and protects towing hook, synthetic rope, cable line. Solid Zinc and Ni Coating Carbin Steel Screws can resist oxidation and corrosion, more durable. Whether it is off-road or transportation, rubber stop blocks are a great winch accessory COMPATIBILITY: Rubber winch stopper compatible with all synthetic cables or steel cable up to 15/32" in diameter (12mm). Ideal for ATVs, UTVs, ORVs, SUVs, Trucks, Jeeps, Trailers, sport-utility, off-road vehicles and multi-purpose vehicles, and for use with winch rope line winch hook - best off road recovery accessory EASY INSTALLATION: Nilight Winch Cable Hook Stop is a Two-piece Silicone Rubber Design with 4 Strong Carbon Steel Bolts, 4 Lock nuts and 4 Washers, with the Addition of a Portable Allen Wrench Tool and a Split Design for Easy Installation PACKAGE INCLUDES: 1 Winch cable hook stopper (w 4 machine screws, nuts, washers), 1 Allen wrench for installation. If you have any problem with your product, please feel free to contact us