Our Cylinder Style Single-Sided Knob is a traditional-styled shower door knob handle used for sliding shower door installations and other shower enclosures. This durable and easy-to-use knob features a 3/4" (19mm) diameter cylinder shape with a glass thickness ranging from 1/4" to 1/2" (6 to 12 mm), giving it a sophisticated and elegant appearance. The plastic sleeve provides a comfortable grip while protecting the knob from wear and tear, ensuring that it maintains its polished look for years to come. The sleek design complements any decor style, while the durable construction ensures that it will stand up to daily use. Installation is quick and easy, thanks to the included hardware and back-to-back design, providing a secure and easy-to-use grip for opening and closing. *Please note: The hole must meet the required size of 3/8" to 1/2" (10 or 12 mm).