HEAVY DUTYQUIET SWITCHES E-Z wire and screw terminals take #14 or #12 solid copper or copper-clad conductors. Release slots provided. Extra common terminal for feed-thru wiring. Break off plaster ears, captive mounting screws. Mounting strap riveted to top and bottom housing. Terminal screws are large head, staked and backed out. Grounding switches have green hex-head deep slotted terminal screw for connection of equipment grounding conductor.