... machinies, lathes,Milling machine,Grinder,Radial drilling machine and so onMeterial:SGCC(galvanized sheet),stainless steel, copper, brass, aluminum,etcFinish:zinc/chrome ... production process:Mold-designment,cutting,punching QC,packing and deliveryAll the material and surface treatment conform to ROHS environmental requirements metal case for crystal oscillator