Leviton 8647-100 Mogul Base, One-Piece, Adapters/Extensions, Incandescent, Glazed Porcelain Lampholder, 2-3/8-Inch, For Porcelain Sockets Only, White Color: White Application: To Be Used in Porcelain Sockets Only Construction: One-Piece Screw Shell Material: Nickel-Plated Copper Alloy Shell Material: Glazed Porcelain