... quality control 3.ISO9001:2000 4.investment casting casting wing nuts We are able to supply the products as follows: ... , Centrifugal Casting, Forging and Stamping etc. 3) Machining Types: Machined by Round Bar and steel plate, Drilling, Milling, Turning, Boring ... , Slating, Grinding,, NC/CNC Machining etc. 4) Tolerance is controlled by CMM Machine. 5 ...