Open end wrenches 12x13mm,have two different sized ends on the same wrench and are one of the most common and versatile wrenches. The smaller the wrench end opening, the shorter the body of the wrench, and this is proportionate to the maximum leverage that can be applied to the head of the bolt or nut.
Precision broached ends for a perfect fit on nuts and bolts
Oval body for a more comfortable grip
High quality chrome-vanadium and heat treatment