This solid brass Shower Door Contemporary Style Knob is available in several beautiful finishes. The knob measures 1-3/16 inch (30 millimeter) diameter and stand 1-3/16 inch (30 millimeter) from the shower door surface. The end cap for this single-sided knob stands 1/4 inch (6 millimeter) from the shower door surface. It requires a 1/2 inch (12 millimeter) hole in glass for installation. This shower door knob is used by several shower door manufacturers.