Material: Knobs are made of zinc alloy. Good texture, strong and durable. No deformation after long-term use.Round Knob Size: Diameter: 30mm; Height: 21mm; Base Diameter: 17mm; Screws length: 26mm. Please confirm the size carefully before ordering.Simple design: The black matte knobs look simple and exquisite in appearance. And the external of the knobs adopt excellent polishing process, makes the knobs flat , smooth and comfortable for gripping.Wide Application: Ideal for cabinet, cupboard, wardrobe, dresser, drawers, doors or other furniture in your kitchen, bathroom, living room. Our round black knobs are all-match and simple, suitable for various decorative styles.Easy to install: cabinet knob is easy to install. It comes with 20 screws. You only need to install the screws into the screw holes of the knob from the back, and then tighten them with the screws.