Amethyst (purple) glass cabinet knobs - made from the finest silica glass and were individually hand made by professional glass workers. Measure 1 1/2 inches (38 mm) in diameter (measured from point to point on the hexagonal) and they have a projection of 1 1/2 inches (38 mm). Sold individually and come with the 2 1/2 inch Chrome mounting hardware. If you desire a flush finish on both sides of the cabinet - we suggest the use of Chrome or Brass caps. These metal caps fit into the glass - allowing the bolt to be screwed in from behind - providing an identical look and a flush finish (shown in the photo below).