Stanley® PROTO® Spline Combination Wrench

High performance torque to withstand the heaviest usage. Spline fasteners help tighten high strength bolts to high torque loads. They help lower the force required to turn standard fasteners by allowing the torque load to be moved away from the corners, helping prevent fastener rounding. They also turn faster with damaged corners. Spline helps reduce foreign object debris (FOD) by having a precise fit between the fastener tool and its fastener. Anti-slip design (ASD) open end.