Proto J1100R Box End Wrench Set, Alloy Steel, Chrome, Insulated No, Number of Tools 7, 5/16 inch to 1 1/8 inch

Features

• These box-end wrench sets have a double end and a different SAE (inch) size on each end for use on two different size fasteners. 
• The enclosed head on each end of the handle provides more contact to the fastener and allows more torque than an open-end wrench since the box end is less likely to slip off the fastener.