Transform kitchen and bathroom cabinets with old fashioned white porcelain knobs. For over 100 years White porcelain knobs have been a favorite on furniture and cabinets. White porcelain knobs have a smooth solid front with an attractive and easy to care for translucent white finish. Kitchen cabinets typically use 1-1/4" knobs for cabinet doors and drawers. White porcelain knobs have a solid front and attach from the back. Screws Included.