Copper Compression Lug with Sight Hole, Conductor Size: 4 AWG, Conductor Diameter: .292", 1-Hole Stud, Stud Diameter: 3/8". For use with Copper Conductors in Grounding, Bonding & Direct Burial Applications. 45 and 90 deg angles are UL listed and CSA certified Beveled entry for easy cable insertion Color coded barrels are marked with die index numbers Connectors are suitable for voltages up to 35 kV Connectors are UL listed and CSA certified with Penn-Union™ by Techspan®, BURNDY®, T and B, huskie, Greenlee® and Versa-Crimp® style tooling Inspection window to ensure full cable insertion Manufactured from high conductivity seamless copper tubing TiN coated to inhibit corrosion