Material & Quality: The installation base is made of metal to make anti-rust, firm hand feel, sturdy and durable, pretty artistic and easy to install. Each knob is packed with box, prevent scratch and collision Check Size: Knob Height: 38mm/1.5"; Knob Diameter: 40mm/1.57", Thread Diameter: 4mm/0.16"; Screw Thread Length: 25mm/1", 22mm/0.87", fit for board thickness: 14-19mm/0.55"-0.75"; 16-20mm/0.63"-0.79" Package Content: 4 x Ceramic Knobs, 8 x Screws; We provide two sizes of mounting screws for easy installation, which can be selected according to the thickness of the different boards. If the screws are not suitable, please prepare your own screws Good Replacement: The shape design is ergonomic, the elegant design is good match your home decoration. Good replace your old knobs, decorate your furniture Applicable Objects: Suitable for wardrobes, shoe cabinets, cabinets, TV cabinets, drawers, computer desks, office, jewelry storage boxes and other furniture. Great gift for new home decoration, furniture renovation and so on