These are bimetallic parallel groove clamps (PG clamps) designed to connect aluminum conductors, commonly used in overhead electrical power distribution.The clamps feature a high-strength, corrosion-resistant aluminum alloy body and steel bolts for securing the conductor.They are specifically intended to prevent corrosion when joining aluminum to copper wires.The "Cu10-95" and "AL25-150" markings indicate the wire diameter capacity in square millimeters for copper and aluminum conductors, respectively.