Incandescent Lampholder Porcelain, Medium Base,660W-600V One-piece Keyless, White Glazed Porcelain PKD1/Polybag/10/Leviton Large Box 100/Carton Contractors Pack. With-nickel Screw Shell, Body Stamped Ul,center Contact Stamped Ul And Csa, Screw Terminals Eyelet Assembled, Terminals Screws Out, Screws Pkd 2/bag.