Chrome Plated, Single-sided Cylinder Style Shower Door Knob. Knob measures 3/4" in diameter and stand 1-1/4" from the door surface. The end cap stands 5/32" from the door surface. Solid Brass construction. These shower door knobs include clear plastic handle end washers as well as an interior plastic washers to protect glass against metal contact. Accommodates 1/4" to 1/2" glass. Requires a 3/8" to 1/2" diameter hole for installation.