Fully Threaded Lamp Holder Kit with Screw Collar Rings

: This is an E27 (Edison Screw) medium base lamp holder manufactured by Arditi featuring a fully exterior-threaded body accompanied by matching shade retaining rings (screw collars). Available in Glossy White, Glossy Black, and Glossy Gold finishes, the full external threading allows lampshades or decorative diffusers of various thicknesses to be clamped tightly at any height along the socket body.