Package Contains Only 10 [Durable Star Knobs]: These star knobs are made of plastic and brass and are not only sturdy to use, but also non-conductive and lightweight. Simply tighten or loosen by hand for simple protection of your mechanical projects. [Star Handle] Using these button nut screws for mechanical projects can really help you provide a more comfortable grip. In addition, you can adjust the machine tool without scratching yourself. [Brass Internal Thread] These clamping knobs with brass internal thread perfectly match compatible bolt threads. Hold tight and won't slip. [Widely Used] These star knobs are suitable for cabinets, drawers, doors, lockers, tool boxes, appliances and other furniture or equipment that needs frequent adjustment. Ideal for your different applications. Widely used in all fields of industry and life, our star button will be a good choice for you.