The Heritage Brass 38mm C3990 Cupboard Knob Polished Brass features a perfectly rounded shape with a stepped design on the face. Knob Finish This knob has a polished brass finish and 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 cupboard knob measures at 38mm, the base measures at 16mm and it has a 32mm projection. It is supplied with appropriate fixing screws.