Mini Bi-Pin Socket up to 75 Watts Ceramic Body with Mica Covers for light bulbs with base GU5.3. G4, MR11, MR16 Use this to fit any MR16 or MR11 bulb into a hard wire system Dimension : 17 mm Dia x 10 mm H / 150 mm Wire High quality holder fitting for standard MR16 MR11 lamp Plug in LED bulbs and attach it to normal lighting wires Round ceramic base, two tier. Pair screw mount holes recessed