Fluorescent Lampholders Medium Bi-Pin G13 for T-8/T-12 Lamps. White polycarbonate body, rated 110 degree C. Turn lock type. Available with centre hole for butt-on mounting, side slots, mounting grooves or mounting brackets. Available shunted for use with rapid or program start electronic ballasts; saves time and makes wiring easier. Many models to choose . Two wire ports per terminal for easy harness wiring.