T20 Wedge 7443 Socket with pigtail wires. Made of plastic and metal materials. This socket works with 7443 led light bulbs. Since it is 7443 there are two levels of brightness bright and dim. There are three wires ground, dim and bright. CE and Rohs listed. You can use this for both 7443 dual filament or 7440 signal filament bulbs. The Socket Size : 32 x 23mm/ 1.3" x 0.9" (D*T)