These CRL 6" Tubular Back-to-Back 3/4" Diameter Shower Door Pull Handles are constructed of heavy wall brass tubing. Brass back-up washers and nylon spacer washers are included to protect against glass-to-metal contact. Specifications: Material: 3/4 inch (19 millimeter) Diameter Heavy Brass Tubing (1.5 mil thick) This Package Includes Two Each Pull Handles Fits Glass Thickness: 1/4 to 1/2 inch (6 to 12 millimeter) Hole Diameter Required: 1/2 inch (12 millimeter)