HIGH QUALITY AND DURABLE - These knob handles are made of high quality plastic and copper, corrosion resistant, have good toughness and impact resistance, and have a long service life. STAR DESIGN - The six-pointed star and thread design provide a comfortable grip. The surface is carefully polished, smooth and burr-free, and will not hurt the palm of your hand when holding it. EASY TO USE - Screw design, easy to install, just align the internal thread with the screw and rotate it vigorously. They are excellent accessories and can replace old or damaged handles. EASY TO USE - Screw design, easy to install, just align the internal thread with the screw and rotate it vigorously. They are excellent accessories and can replace old or damaged handles. YOU GET - 14pcs M8 Black Threaded Clamp Knobs. Internal Thread Diameter: M8; Head diameter: 30mm 1.18"; Height: 13mm 0.51".