Shanghai BST Fasteners Co., LTD is an ISO9001&ISO14001 certificated company, which has been specialized in manufacturing fasteners since 2003.so BST FASTENERS has a wealth of expert technical experience in fasteners. It covers an area of 50,000 square meters and more than 300 staffs. Our company main products carbon steel and stainless steel bolts, nuts, machine screws, self tapping screws, wood screws, chipboard screws, drywall screws, pins, rivets, washers, self drilling screws, anchors, ...