These high quality sockets, or lamp holders, are specially designed for use in the repair and restoration of fine portable lighting and the manufacture of custom lighting. These sockets have an E26 base, sometimes referred to medium base or Edison base, and accept your standard sized household light bulb. The bottom cap is tapped 1/8 IP, which measures 3/8" diameter, and also comes with a set screw for a more secure fit. These are the lamp sockets of choice when mounting UNO fitter style lamp shades to bridge arm floor lamps. These sockets have a regular On/Off function, are rated 250 watts – 250 volts, and are U.L. and CSA Listed. B&P Lamp Heavy Turned Brass Socket With Brass Knob, Nickel Plated Finish, On/Off Function, Uno Thread Shell - Nickel Plated high quality, U.L. listed lamp holders are specially designed for use in the manufacture and restoration of fine table and floor lamp lighting. Each style comes with a threaded cap and shell for superior strength and beauty. These are the lamp sockets of choice when mounting UNO fitter style lamp shades to bridge arm floor lamps. Large solid brass turn knob style switch with on/off interior and UNO thread style shell.. Features Include: These high quality sockets or lamp holders are specially designed for use in the repair and restoration of fine portable lighting and the manufacture of custom lighting., These sockets have an E26 base sometimes referred to medium base or Edison base and accept your standard sized household light bulb., The bottom cap is tapped 1/8 IP which measures 3/8" diameter and also comes with a set screw for a more secure fit., These are the lamp sockets of choice when mounting UNO fitter style lamp shades to bridge arm floor lamps., These sockets have a regular On/Off function are rated 250 watts – 250 volts and are U.L. and CSA Listed.