The GL114 Copper Compression Lug with Peep Hole, 1 AWG, 1/4” Bolt Size is the perfect compression connector for secondary power distribution systems. compression connectors allow for easy inspection to ensure the complete insertion of copper cables. Made from high-conductivity copper tubing, they are also color-coded and marked with die index for easy reference. Copper compression connectors have a max voltage rating of 35kV when properly installed. Contains one mounting hole and a mounting bolt size of 1/4”.