... sink 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 LIGHT2 ... .materials:.6000 aluminum alloy ,sepcial 6063, 30003.fin tolerance: 0.05 mm +/-.at least.4 ...