Eaton Wiring Devices 604-SP Lamp Holder, 250 VAC, 660 W | Porcelain. Mounts on 4 in outlet boxes with breakout for 3-1/4 in box mounting. One-piece with feed through. Terminal screws backed out for wiring without removing the interior. UL 496 listed, NOM Certified, meets CSA requirements. 250 V, 660 W.