... is good Aluminum.Meanwhile,we can use other materials accordingto customer's demand .SizeThe Diameter :Generally,it is M2-M12 in our fasteners.The ... more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2. Our company had good ... fasteners match with machine,furniture ,drywall ,wood and so on.4. We have strict quality control from producing to delivery.Our company ...