Stanley Proto J2729SW Heavy Duty 6 Point Straight Striking Wrench 1-13/16 Inch,Stanley Proto,J2729SW" /> Black oxide finish Large striking surface for surer blow contact and more efficient transmittal of force to fastener. For use where extreme force is necessary to loosen or set large fasteners. Straight handle design helps prevent the wrench from cocking when struck. Heavy box walls provide greater torque transmission.