Metric Flare Nut Wrench for Working at Height Here at Secure Tools, we provide a large selection of metric flare nut wrenches for working at height. Ideal to use within various industries, such as rigging, static cabins and general DIY enthusiasts, our metric flare nut wrenches are effective at tightening or loosening hexagonal nuts and fittings. We stock lots of different sizes of metric flare nut wrenches, ranging from 8-10mm up to 22-24 mm. And each one includes a sturdy open ring attachment point so you can safely tether it to a belt or harness, preventing tool droppages. Furthermore, they’re incredibly durable, meaning you can rely on our metric flare wrenches to deliver in all conditions when working at height.