Double ring wrench sets. Tried and tested combinations of double ring wrenches. Metric. Ideal for deep-seated screw connections. With strongly cranked double ring profile. Universally applicable for actuating and holding screw connections. High-quality, durable industrial quality. Flat heads for tight spaces. Pleasant grip, due to matt chrome-plated surface, even with oily hands. Heads ground fully automatically. With SmartDrive profile which protects the screw and nut heads, as the force is transmitted to the flanks and not to the corners, for longer life of screw and wrench. All important sizes in one set. 8 pcs. Set in sturdy premium roll bag with water-repellent surface and comfortable Velcro fastener. Made of chrome-vanadium steel / matt chrome-plated. DIN 838 / ISO 3318 / 1085 / 10104.