Westward 5MP99 Box End Wrench These box-end wrenches have a double end, with a different metric size on each end. This design allows for use on two different-sized fasteners. The enclosed head on each end of the handle provides more contact with the fastener and allows for more torque compared to an open-end wrench, as the box end is less likely to slip off the fastener. Material / Alloy Steel Finish / Satin Head Size / 10 mm; 11 mm Overall Length / 7-3/4 inch Head Offset Angle / 40 ° Measurement Type / Metric Head Type / Offset Tether Style / Tether Capable Nonsparking / No Insulated / No Non-Magnetic / No Wrench Shape / Straight Box End Type / 12-Point Box End Wrench Length Style / Standard Corrosion Resistant / Yes Ratcheting / No Reversing / No Handle Type / One Piece Grip Style / Plain Handle Color / Silver Number of Points / 12 Single End/Double End / Double End Min. Arc Swing / 5 ° Standards / ANSI Standards