The Shower Door Knobs gives a firm grip and designer styling to a frameless shower door. The size is 30mm in diameter, and stands 28mm from the glass surface. Back-to-Back style Knobs are suitable for most any bathroom door. It is usually suitable for 6 to 12 mm temper glass. Custom finishes are available on request. It is the most popular type of shower door knobs which is made from high quality brass material with good finish.