Metric Insulated Ring Ratchet Wrenches for Working at Height Secure Tools provide a wide selection of metric insulated ring ratchet wrenches for working at height safely. Available in a variety of metric measurement sizes, ring ratchets designs feature a fine-toothed ring that lets you easily fasten and open nuts and bolts without interruption. Our insulated ring ratchets are made using only the highest-quality materials and built to withstand decades of hard-wearing use– even in arduous work conditions. Moreover, the inclusion of top-grade insulation in the ring wrench’s design protects against electric shock up to 10,000 volts. And as an additional safety feature, each metric insulated ring ratchet wrench comes fitted with a solid open ring attachment point, giving you a reliable place to tether the item and prevent accidental droppages when working from height.