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50pcs-1000 1W 3W 5W Heat Sink LED Aluminum Base Plate PCB Board Substrate 20mm Star Kit DIY Cooling Heatsink 20 mm for 1 three five W Watt Diameter:about 20mm/16MM Color: white and black Thickness: about 1 Surfacetreatmentprocesses:anodizing Application: use for welding 1 piece LED beads (1W or 3W) Package Included:20/50/100/500/1000pcs PCB as you selected.