Aluminum Compression Splice, Tin-Plated to inhibit corrosion, high conductivity thick wall aluminum, factory pre-filled joint compound and sealed with easy pull-out end plug to inhibit corrosion, Panduit and specified competitor die index numbers marked on barrel for proper crimp die selection, Internal solid stop prevents over-insertion of conductor, UL Listed and CSA Certified to 35 kV and temperature rated to 90°C when crimped with Panduit and specified competitor crimping tools and dies.