... aluminum alloy ,stainless steel,plastic. 2)Suitble for strain clamp insulation sring . 1)material: High strength aluminum alloy , ... meterial ensures the double insulation of the neutral core and avoids damage to sheath parts,no tools required ... installation. Economical cost5)Application:Suitble for strain clamp insulation sring .earial insulation aluminum core wire terminal or two ends fixing ...