... sink 2.used for AMPLIFIER,CUP,CERAMIC,CIRCULAR,LED LIGHT 3.tolerance:0.05 mm +/-. 4.finish:anodized ... sink for using industry over and amplifier big CUP,CERAMIC,CIRCULAR,LED LIGHT2.materials:.6000 aluminum alloy ,sepcial 6063, 30003.fin ... .8.PAYMENT:30% TT, 70% L/C ,OR 70% TT. circular heat sink