Conductor Range: 6 AWG to 250 kcmil (MCM) stranded copper wires. Stud/Bolt Size: 3/8-inch mounting hole. Drive Size: 1/4-inch internal hex main drive screw. Voltage & Temperature: Rated for up to 35 kV (with proper high-voltage insulation spacing techniques) and a maximum temperature of 90°C.Pre-Filled Compound: Contains DE-OX® oxide inhibitor to protect contact surfaces from corrosion. Certifications: UL 467 Listed (Grounding and Bonding), UL 486A/B Listed, and CS