uxcell 10Pcs Dual Terminals T5 T4 Fluorescent Tube Bulb Lamp Holder Socket Product Name : Fluorescent Lamp Holder Ballast;Fit Fluorescent Lamp : T5 T4 Size(Each One) : 28 x 22x 19mm / 1.1" x 0.87" x 0.75"(L*W*T);Mounting Hole Diameter : 3.5mm/ 0.14" Material : Plastic;Main Color : White, Green Net Weight : 38g; Package Content : 10 x Fluorescent Lamp Sockets locking screw in base for secure fitting; Durable, heatless and long-lasting