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1 & F Brass Thumb Screw: #4-40, Knurled Head is a high-quality thumb screw that offers secure fastening for professionals working in automotive, hardware, and aerospace industries. Made of corrosion-resistant brass, this thumb screw is durable and long-lasting, providing precise fastening in even the most demanding applications. Its knurled head makes adjustment and installation easy, making it an essential tool for any professional's toolkit.