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TSR/Tsingri SS316+SCM435 Torx Pan Head Bi-Metal Screws Full Thread Self Drilling Screws, Find Details and Price about construction screws roofing fasteners from TSR/Tsingri SS316+SCM435 Torx Pan Head Bi-Metal Screws Full Thread Self Drilling Screws - Suzhou Tsingri Fasteners Co., Ltd.