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Order LookupCombination Wrenches
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Combination wrenches have a box end design on one side of the handle and an open end design on the other side. The box end is an enclosed head end that fits around and grips the entire head of the fastener. It provides more contact to the fastener than an open end design and can apply more torque since the box end is less likely to slip off the fastener compared to the open end. The box end can only access a fastener from the top while the open end design allows top and side access to the fastener.