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. Each socket comes with a threaded cap and shell for superior strength and beauty. These sockets have an E26 base, sometimes referred to as medium or Edison base, and are designed to fit your typical household-sized 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 sockets have a 3-Way interior that are designed for 3-Way bulbs (low, medium, and high) and are rated 250 watts - 250 volts. They are also U.L. and CSA listed. B&P Lamp Heavy Turned Brass Socket With Brass Knob, Antique Brass Finish 3-Way Function, No Uno Thread - Antique Brass finish, 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. Large solid brass turn knob style switch with 3-way interior and plain 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., Each socket comes with a threaded cap and shell for superior strength and beauty., These sockets have an E26 base sometimes referred to as medium or Edison base and are designed to fit your typical household-sized 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 sockets have a 3-Way interior that are designed for 3-Way bulbs (low medium and high) and are rated 250 watts - 250 volts. They are also U.L. and CSA listed.