Outer Diameter:88mm Inner Diameter: 32mm Height:50mm Material: Aluminum Application: UseFor 10W 12W 15W 18W LED PCB cooling working temperature Package Include: 10pcs 15W 88mm*50mm LED Radiator Notice: kit no longer include the 15w 80mm pcb. if you would like it, click this hyperlink to buy: This Heat Sink can go well with for our product: 220v 15w Lamp plate. if you'd like it, click this hyperlink to buy: