สลักเกลียวหัวกลม

We are XIAOGUO factory of China provide advanced Round Head Bolt. It is Similar to the screw,you can get low price/discount round head bolt from here .The Round Head Bolt is a type of fastener consisting of two parts of a round head and a screw (a cylinder with external threads), which needs to be matched with the nut for fastening two parts with a through hole.