... . Delivery:15-30days 5. Nice after-sale service Specification1.Thread type: machine thread, triangle thread, metric thread, tapping thread, drilling thread ... , half thread, full thread etc.2.Head type: Hexagon head, Mushroom head, Pan head, Countersunk head,Bugle head ... :ZINC PLATED,BLACK OXIDE,HDG,PLAIN,NICKLEPACKING:SMALL BOX head cap screw din912