What is this?The fluorescent lamp start device base widely used for holding the fluorescent lamp start device. Good replacement for repairing fluorescent lamps.What will I get?Material: Plastic, MetalTotal Length: 40x28x13mm / 1.58"x1.1"x0.51"Package Content: 4 x BaseAre there any advantages of the product?Replacing a fluorescent lamp start device base might be a good solution for repairing a fluorescent lamps.How to use it?Easy to install, directly install it in the light tube and wiring.What should I notice?Please check the size before buying.