Proto Torqueplus 12-Point Combination Wrenches, Satin Finish, 1 1/2" Opening, 20 1/4" (577-1248) EachTorqueplus fastening system drives off fastener body, more easily removing damaged fasteners. Reduces risk of fastener rounding. Applies more torque to fastener. Unique arc design increases surface contact. Anti Slip Design (ASD) wrench has a locking groove prevents slippage and knuckle injury. Shank is positioned at the center of box end, reduces the tendency of the wrench to cock. Wrench Type: Combination; SAE Metric: SAE; Opening Size: 1 1 2";