Recessed Knob for Fingertip Control 1/4-20 Threading Adapts to Most CRL Towel Bars Ideal for Bypass Sliding Doors Stocked in Four Popular Finishes 13/16" or 7/8" (20.6 or 22.2 mm) Hole Diameter Required For 1/4" to 1/2" (6 to 12 mm) Thick Tempered Glass The CRL Finger Pull Knob is ideal for use with CRL Bypass Sliding Shower Door Systems. They allow for easy opening of the doors from inside the shower enclosure. The 1/4-20 threading of the Finger Pull Knob makes it compatible with most other CRL Towel Bars and Knobs, including our BMNW Series. Stocked in our four most popular finishes. Custom finishes available upon demand.SPECIFICATIONS:Material: Solid BrassAvailable Finishes: Brass, Chrome, Brushed Nickel, and Oil Rubbed BronzeGlass Thickness Range: 1/4" to 1/2" (6 to 12 mm)Hole Diameter Required: 13/16" or 7/8" (20.6 or 22.2 mm)