Stanley Proto J5334CF 1/2-Inch Drive Open-End Crowfoot Wrench, 1-1/16-Inch Crowfoot wrenches are used in hard to reach, restricted access situations where a standard wrench or ratchet cannot reach Anti-Slip Design Open End (ASD) The arched surfaces are designed to spread the contact forces over a greater area and they keep the loads off the corners of the fastener Broad size range ensures the right tool for the application will be available Typically used in lower torque applications