Towel Bar Back to Back CTC 18"X18" With Metal WasherEquipped with gaskets to protect glass from damage. Ergonomic design for a comfortable and secure grip. Compatible with glass, wood, and aluminum metal doors. Ideal for shower doors, glass office doors, porch doors, wooden doors, barn doors, and more. Requires a 1 2" (12mm) diameter cut out hole for installation. Crafted from solid brass for durability and strength.