... 15-30days 5. Nice after-sale service Specification1.Thread type: machine thread, triangle thread, metric thread, tapping ... thread, half thread, full thread etc.2.Head type: Hexagon head, Mushroom head, Pan head, Countersunk ... Socket, Torx, Rice character type, One Way etc.MaterialCarbon steel, stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze ... PLAIN,NICKLEPACKING:SMALL BOX head cap screw din912