This 10-pack bakelite knobs with copper core is designed for versatile use across industries. With optional sizes (M4-M12), it fits various machine tools and equipment. The copper threads boost durability, while the smooth polished surface provides a comfortable grip to ease hand fatigue. Made of high-quality bakelite, it delivers strong insulation, heat and corrosion resistance for different environments. It works great as a replacement for machine handles, meeting assembly needs in woodworking, electronics and textile fields.