About Top Knobs With strong roots in attention to architectural detail and high quality materials, Top Knobs is one of the best names in home hardware today. With a complete line of hand-finished knobs and pulls in nearly every style imaginable, their products are enhancing the look of homes all over the country. You"ll find a wide variety of beautiful finishes and designs, every one of which comes with a lifetime guarantee. Constructed of cast iron. 1.12-inch knob projection. Includes M4 screw pack for quick installation. Available in a variety of finishes. Knob measures 1.37 diam. in..