1This ball handle knob is made of high quality plastic materiel, with long serving life 2Threaded knob, is a good replacement for machine operation handle 3Fine workmanship, polished surface, not easy to comfortable grip 4This ball handle knob is easy to install, convenient for use 5Widely used in video games, machine, combination machine tools, woodworking machine and printing, textile, food, mining, automobile and other fields, convenient operation Descriptions: This ball handle knob is made of high quality plastic materiel, with long serving life. Widely used in video games, machine, combination machine tools, woodworking machine and printing, textile, food, mining, automobile and other fields, convenient operation. Features: This ball handle knob is made of high quality plastic materiel, with long serving life. Threaded knob, is a good replacement for machine operation handle. Fine workmanship, polished surface, not easy to comfortable grip. This ball handle knob is easy to install, convenient for use. Widely used in video games, machine, combination machine tools, woodworking machine and printing, textile, food, mining, automobile and other fields, convenient operation. Specifications: Material: plastic Type: Ball Shape Diameter: 40mm/1.57inch Hole Thread Diameter: M12 Weight:282g Package Included: 6 x Machine Handle Knob