... required 3. High precision Focusing set of Microscope 1.This eyepiece convergence set is made of LY(aluminum) raw material,lathing, milling ... etc.2. cover is blacken finishing,3. machining parts of Microscope Chengdu Khons Trading Co., Ltd.--High Precision CNC Machining ... Blacken, Hardening, Painting, Silk printing and many other treatment of the parts.4.Quality Assurance IPQC inspect each during every ...