1.aluminum heat sink 6063 T5 2.used for AMPLIFIER,CUP,CERAMIC,CIRCULAR,LED LIGHT 3.tolerance:0.05 ... mm +/-. 4.finish:anodized 1.aluminum heat sink for using industry over and amplifier big CUP,CERAMIC,CIRCULAR,LED ... .PAYMENT:30% TT, 70% L/C ,OR 70% TT. aluminum heat sink