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Package Quantity is 2,4,or 8pc’s. (2=1 Black & 1 Red)(4=2 Black & 2 Red)(8= 4 Black & 4 Red)The Stainless-Steel Standard Coarse Threads are 5/16-18 x 3/4" in length. Fully Threaded. The KNOB is made of Acetal resin. Strong and Durable. Thread Material – Stainless Steel - anti-rust and anti-corrosion, strong and durable. These Thumb Screws come in many different lengths. If you don’t see what you need, inquire through the Amazon contact seller page and I will list your requirements if not already listed.