Keyless plastic ceiling lamp holders are molded of high temperature, thermoset plastic to reduce breakage. Mounts on 4 in outlet boxes with breakout for 3.25 in box mounting. Leads are 6 in 105 deg c insulated stranded no 16, stripped 0.75 in. Pull chain devices include ball chain, 3 ft of cord, connector and end bell. Top wire versions have terminal screws backed out - ready for wiring - without removing interior. Push wire terminals are top wired with two push-in terminals and two screw terminals for continuous wiring. Sockets available in two-piece version to permit interior replacement, dust ring protects against plaster and dirt. Shade grooves provided on two-piece units.