The Fingertip Design 30mm Diameter Ball Cupboard Knob Polished Brass is made from solid brass, a traditional material.  Available in a range of sizes and finishes, this is a high quality knob from a well known leading brand. Knob Finish This knob has a traditional polished brass finish.  It would be suitable for all types of fitted or free standing furniture in residential situations and is simple to fit and maintain. Cupboard Knob Dimensions The Ball Cupboard Knob has a 30mm knob diameter and 38mm projection. It is supplied with appropriate fixing screws.