Connect multiple wires to a single lug. The stacked design takes up less lateral space than our other lugs for multiple wires, where the holes are arranged side to side.

Set screw lugs attach to even larger wire than compression lugs, such as the 750 MCM building wire used in large factories. They're also easier to install and reusable because you cinch the wire with a set screw rather than crushing the barrel. They don't hold the wire as securely as compression lugs, however—use them when pulling and bending aren't a concern and you need to easily break your connection for maintenance or adjustments.