1 Port Double Screw Panelboard Lug 1500 MCM - 1000 MCM Panelboard Lugs are large size set screw connectors with multiple mounting holes for a secure, turn-prevent connection. Made of 6061T-6 aluminum alloy. Tin plated for low contact resistance. Suitable for use with both copper and aluminum conductors. Rated 600 volts. Mounting hole spacing is 1 3/4" from center to center.