We are a manufacturer of fasteners in Shanghai of China, we can supply many kinds of screws,especially produce drywall screw and chipboard screw.Shanghai On-Fastener Manufactory Limited  which was set up in 1984,has been developing rapidly for tweeny years from the beginning of the production of the woodscrews up to the series of the over 10 various kinds of screws which are sold well both at home and abroad,and for 4years it has been rewarded as A-grade enterprise by the company.