* KT kposara bụ otu ụdị eri pụrụ iche na-akpụ ma ọ bụ skru na-egbutu eri maka plastik, ọkachasị maka thermoplastics. A na-eji ha eme ihe na ụlọ ọrụ ụgbọ ala, ngwá electronic, wdg.
* Ihe dị: carbon steel, igwe anaghị agba nchara.
* Ọgwụgwọ elu dị: zinc plated ọcha, zinc plated blue, nickel plated, black oxide, wdg.