Leviton #6151 dimming light socket lampholder - for use with incandescent lighting only - will not work with LED bulbs. Used to replace existing cores or for custom applications. This requires a Leviton #6151 lampholder shell which is a larger diameter than a standard lampholder shell - WE DO NOT HAVE ANY OF THE 6151 SHELLS - so you will either need this for replacement of an existing dimmer or locate your own shells. Once again, this will not fit inside a regular size lampholder shell. This core has a 1-3/8" diameter at the bottom, 1-1/4" diameter at the top, and is 2-1/8" overall. These are great for building your own dimming lamp or they can be used to convert a normally switched lamp to one with dimming capabilities. Offers full range dimming control. Features include: