The GL1048 Copper Peep Hole Compression Connector features one mounting hole, sized for 1/2. mounting bolts, and one chamfered port to terminate a 1/0 AWG conductor. Compression connectors allow for easy inspection to ensure the complete insertion of copper cables. Made from high-conductivity copper tubing, the pink color-coded markings with die index makes for easy reference. The closed barrel design is simple, reliably functional and sealed against moisture or contamination. When bonded, it creates a homogenous connection between the connector and conductor, forming a vibration-resistant, mechanically strong unit. Use for many applications including secondary power distribution in buildings, power plants, industrial applications or with electrical equipment. Don.t settle for less . choose NSI.