Product Description: These knob handles are made of high quality plastic for durability and long service life. Easy to install and with surface nice finish for comfortable grip. Widely used for mechanical equipment, instrument and apparatus, food and industry equipment. Product Specification: Material: Metal,Plastic Color: Black Head Diameter: 32mm Thread Diameter: 6mm Total Height: 22mm Package Includes: 10PCS Star Shape Hand Knobs Notes: Please allow 1-3mm discrepancy due to manual measurement, we sincerely appreciate for your kind understanding on this.