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Knurled head screws are common in applications requiring frequent fastening and unfastening. The diamond knurled surface on these thumb screws provides optimal gripping allowing the screw to be tightened and loosened by hand pressure alone eliminating the need for tools. Made from solid brass which is a corrosion- resistant alloy. These SAE screws are available in the following thread sizes: 6-32, 8-32, 10-32, 1/4-20, 5/16-18 and 3/8-16. All screws have right-hand threads. All screws are uncoated. All screws have straight shoulders and flat tips. These screws will prove to be useful in a wide variety of industries, environments and applications.