Material- Made of rubber wood and copper, it is durable and has a long service life. Good Performance- It has good performance of high temperature resistance, corrosion resistance, corrosion resistance. aging and insulation. Quantity - We have 20 threaded knobs for your needs, and they are the perfect replacement for old or broken knob handles. Design - With star design and in thread, the surface is carefully polished to provide a comfortable grip for most types of machine tools. Scope of application- Widely used in machine tools, mechanical equipment, instrumentation, industrial equipment food and pharmaceutical industry. Product Description 20PCS Threaded Clamp Knobs are carefully selected quality products that meet your quantity and shape needs. The surface is carefully polished to provide a comfortable grip and is the best choice for machine tool accessories. Material: The tightening knob is made of glued wood and copper. High quality: Screw-in design for high temperature resistance and nice finish for comfortable grip. Easy to use: The knob handle is easy to install and use. Type: Universal, available for most types of machine tools. Size (thread * head): There are two sizes, M8*32mm, M6*32mm. Color: Black Package includes: 10X M8*32mm Clamp Knobs 10X M6*32mm Clamp Knobs Allow small size errors due to manual measurement.