C.R. LAURENCE SDK212BN CRL Brushed Nickel Cylinder Style Single-Sided Shower Door Knob Fits 1/4&quot; to 1/2&quot; (6 to 12 mm) Thick Glass Single-Sided Knob Without Protective Plastic Sleeve Solid Brass Material Use Monolithic Tempered Glass Requires a 3/8&quot; to 1/2&quot; (10 to 12 mm) Hole