... *30ColornatureTypeOEM HK Fine Hongda Technology Co.,Ltd Shenzhen Qin Hongda Precision Machinery Co.,LtdShenzhen Qin Hongda Precision Machinery Co.,Ltd was founded in 2008, which ... etc. 4 .PP,PE,ABS,PET,PVC 5.organic glass, ceramic etc.. Heat treatment:quench hardening,annealing, normalizing, vacuum carburizing, nitrogen ...