Green & Blue Ceramic Cabinet Knobs | Furniture Door Ceramic Knobs | Ceramic Knob Cabinet Knob Ceramic Door Cabinet knob. perfect for your kitchen and bathroom cabinets! It has four backing options- Brass, Brass Antique, Silver and Silver Antique. The knob is 1.7" in diameter and includes screws for installation. As the products are handmade, it may slightly vary in color as well as in designs from the picture.