... 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, ... :30% TT, 70% L/C ,OR 70% TT. led light heat sink