T20 Wedge 7440 Socket with pigtail wires. T20 Wedge 7440 Socket with pigtail wires. Made of injected molded plastic. The wires are about 6" long, and are 18 awg stranded copper wires. Socket Size : 32 x 23mm/ 1.3" x 0.9" (D*T). Works with signal filament led or incandescent bulbs. CE and ROHS listed.