First-String Enterprise Co., Ltd. was founded in 2008 and has been supplying a wide range of high-quality screws, especially drywall screws, self-drilling screws, roofing screws, and self-tapping screws. We have obtained certifications such as ISO9001, EN14566, and EN14592, and are committed to offering exceptional customer service. With our professional expertise and extensive experience, we are confident in providing reliable quality assurance and a sustainable supply.