Keep Your Hook Safe with InfiniteRule Security Custom Fit Locks. Don't leave it vulnerable to theft with InfiniteRule Security custom designed hook lock. Specifically engineered to fit Monster Hook Swivel Hook and Hammerhead Hook, this rugged lock will deter criminals from detaching your valuables. The included machined aluminum hook lock is rigorously tested to a heavy duty 10K LB rating, so you can trust it will withstand attempts to break, cut or pick. The tight fitting weatherproof rubber cap keeps out dirt, water and grime so the lock continues working smoothly. Protecting your investment is our priority. That's why InfiniteRule Security hook locks are 100% made in the USA with premium materials that resist rust and corrosion. We manufacture, ship and service our security products domestically, backing them with our promise to customers. Before ordering, verify the lock span and diameter fit your specific hook. Mixed packs include an additional receiver lock with longer or shorter pins to accommodate different receiver sizes if needed. You deserve peace of mind knowing your trailer won't become a criminal's next target. Choose InfiniteRule Security for heavy duty, custom security and unlock the road to adventure.