... of extrusion window/door: extrusion, cutting, drilling,skiving,milling,fine blanking, deburring,CNC machining, 8)Surface finishing for windows/doors: anodizing, brushing ... ,electrophoresis, wooden grain,wallpaper treatment, hard-anodized, painting and so on9)Surface colors for aluminum window extrusion/door extrusion: natrual, matt black, green ...