It is a set of 2 aluminium mechanical connectors for Compact NSXm and PowerPact B devices. These lugs are made of tin-plated aluminium an are suitable for copper and aluminium conductors. They are fastened to the terminals with lug mounting screws inserted from the bottom. The current rating is from 15A to 125A for copper wires (2.5 - 6 mm), and the torque is 4 N.m +/- 0.4. For aluminium wires, the current rating is from 15A to 125 A (10 - 70 mm), and the torque is 5.6 N.m +/- 0.6.