Designed for use in new fixtures or as a replacement for worn-out sockets, this PLT 90-413 on/off, turn-knob light socket has an easy-to-operate traditional style. With a removable turn knob, it can be replaced or extended to make a subtle yet impressive change to the appearance of the socket. The medium base allows for a 1/8 IPS threading (the standard for most applications), and can withstand a maximum of 250 watts or 250 volts. So, whether you're building or repairing lamps, this brite gilt brass, on/off socket set will provide practical lighting with the option to alter the appearance! Does not include screw set for mounting.