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Crow Foot Spanners, also known as crowfoot wrench, crow’s foot wrench, or crow’s foot, are non-cylindrical open-ended wrenches. They may be used with drive handles such as a ratchet and are used when torque needs to be measured, a prelude to using regular wrenches, or reaching fasteners in tight spaces. Crow foot fasteners are available in different sizes and sets that will meet your needs.