The 1/2 in. EMT Set Screw Connectors (5-Pack) are designed to connect and effectively bond EMT conduit to steel outlet boxes, load centers and other metal enclosures. Their bodies and locknuts are made with die-cast zinc alloy for strength and their set screws are made from zinc-plated steel. Their set screws' Tri-Drive head design works with Phillips, slotted and square screwdrivers.