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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large range of hook locks for trucks, vans, and skip-loaders. We offer self-locking clevis hooks that stop pinching, ball-bearing swing hooks for increased side stability and weight reduction and galvanized hooks that resist corrosion. The performance of the hook-lock mechanism was analyzed by combining the numerical continuance algorithm and bifurcation theories. Nine state variables were determined. Choosing and Eye There are a var