Wrenches are the primary instrument used to construct SK® linear, hybrid and circular ESF frames and are available in two styles: combination and angled open-back. Three sizes are available: 7mm , 8mm and 10mm.

Open and box-end options provide the surgeon flexibility to tighten fasteners, counter torque fixation clamps, and offer more freedom in areas of limited space.

Popular due to ease of use and rapid frame construction. This angled open-back wrench combines the action of a nut driver and box-end wrench in one.