Lightkiwi J7117 3.5 inch Cool White LED Puck Light (Power Supply Not Included) Only 0.28 inch / 7 mm thick (60 percent thinner than standard under cabinet lighting*). Sturdy aluuminum body. One of the best in the market for its exceptional durability. Simple plug-in installation. For most of cases, only tool you will need is screw driver for mounting bracket. 24 voltage offers highly energy efficient, minimum heat contribution, longer life span, and safer. UL listed (File Number. E365383): Modular LED Light Panel and Power Supply have been certified by UL to ensure & maximize the safety.