Feature:1. These knob handles are made of plastic, which has durability and long service life.2. Easy to install, smooth surface and comfortable to hold.3. Widely used in mechanical equipment, instrumentation, food and industrial equipment.Specification:Material: Plastic + CopperColor: BlackInternal Thread Diameter: M8Quantity: 12 piecesNote:1. Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real item.2. The allowable measurement error is +/- 1-3cm.Package Including12 x M8 Nut