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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group offers a wide selection of hook locks for trucks, vans and skip-loaders. We offer self-locking clevis clevis hooks which prevent pinching, ball bearing swing hooks that provide greater side stability and weight reduction and galvanized hooks that resist corrosion. The effectiveness of the hook-lock mechanism was evaluated using a combination of the numerical continuance algorithm and bifurcation theories. Nine state variables were determined. Selecting a Hook a