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Everbilt #4-40 TPI x 1/2 in. Stainless-Steel Knurled Screw (2-Piece per Bag) 831448 - The Home Depot
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Amazon.com: 4-40 x 1/2" Knurled Thumb Screws/Stainless Steel / 100 Pc. Carton : Industrial & Scientific
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303 Stainless Steel Thumb Screw, Plain Finish, Knurled Head, 5/16" Length, Fully Threaded, 4-40 UNC Threads, Made in US (Pack of 5) : Amazon.sg: DIY & Tools
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