Welcome to our store! Durable Star Button: These star knobs are made of plastic and brass, not only sturdy to use, but non-conductive and lightweight. Just tighten or loosen it by hand, and you could make a simple protection on your mechanical projects. Star Shaped GripUsing these screws on the nuts of button on your mechanical projects can really give you a more comfortable grip. What's more, you can adjust your machine tools without scratching. Brass Female ThreadThese Brass Female Thread Clamp Knobs would match the compatible bolt thread very well. Holds tight and won't slip. Wide ApplicationThese star knobs work well on cabinets, drawers, doors, lockers, tool boxes, appliances and other furniture or equipment that requires frequent adjustments. Perfectly adapts to your various applications. Widely used in all fields of industry and life, our star buttons would be a good choice for you. What You GetThis pack includes 10 pieces M8x40 star buttons, made in strict compliance with the standardized metric system. They will do the job! Shipping quantity: 10 PCS Product color: Black Product size: m8x40mm Note: Manual measurement, please allow 1 - 3cm error!!! Please please confirm the size before purchasing! 100% Satisfaction - Our customers are our priority. If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately. We do our best to provide you with satisfactory after-sales service.