Introducing the 7-Star T-Track Knob Kit by POWERTEC. This exclusive pack of 10 contains knobs, bolts and washers stacked together to help secure and upgrade your jig and woodworking kit assemblies. They are designed to offer an additional, long-term clamping strategy for your project, and work seamlessly with any drill press, lathe or saw that accommodates a 5/16"-18 internal thread size (also most ¾ inch wide by 3/8 inch deep tracks). Whether you're a professional or DIY enthusiast, these knobs are easy to use, remove and don't require any tools. Extraordinary Shape Each knob is made with Polypropylene, a heat-resistant thermoplastic known for its toughness and durability. However, its most striking feature is its rugged, ergonomic design which is smooth to the touch and comfortable to hold - eliminating hand injuries caused by poor quality and small, difficult-to-turn wing nuts. Additionally, we have chosen to use a printed brass insert. By doing so, we have eliminated the threat of stripping, while offering assistance in fighting corrosion or rust. These items may be simple in their function, but our engineers have made sure that you will truly experience the quality and craftsmanship that goes into each knob.