Shell material: aluminum The lamp is installed with a magnetic suction function, which is convenient and quick. You only need to insert or remove the lamp from the track for installation or disassembly. Recommended track size: width 30mm * depth 50mm or more, equipped with dust cover and end plug, no extra cost, good quality of life The keel is made on the ceiling, the track is embedded in the keel, the track and the keel are fixed with screws, and the surface of the gypsum board is covered with dust 2-3 times, and the height is reserved at least 55mm The thickened aviation aluminum material has enough material and is reinforced with braces. It is not easy to deform after long-term use. It is safe and reliable. 48V safety voltage, no risk of touching, safe low-voltage current, no fear of touching when the power is on Note: Manual measurement, there may be slight differences in size, but the effect is not great, please rest assured to buy