Professional 2pcs/set Aluminum Cooling Heatsink/ Heat Sink for 12mm Diode Module heatsink3 It can be used as the laser heat sink module Inner diameter: 12.3mm Size:32*20-27(mm) (L*W*H) Centre-Height:17.5mm Cooling effect is very good. Suitable for 12mm red, green, blue-violet light or IR laser module. Good cooling effect, increase module usage time. Material: Aluminum Packing:2pcs/set