Ceiling mount lamp holders fit a wide variety of applications and needs for every room in the home, from attic to basement, closet to garage. Two-piece with feed through 4 screw terminals. Top wire versions have terminal screws backed out ready for wiring without removing interior. Porcelain models made of high-strength insulator porcelain. Pull chain devices include ball chain, 3-in of cord, connector and end bell. Mounts on 4-in outlet boxes with knockouts for 3.25-in box mounting