Glass Door Knobs, Square, Stainless Steel, 304 Grade – Door Handle Pull Knob for Glass, Wooden and Fibreglass Doors Double-sided Square, 2” back-to-back knob set available in two sizes: 50 mm and 75 mm diameter. Ideal for Shower Glass Doors and Wooden doors. Dual application: Fits Glass Doors up to 12 mm and Wooden doors up to 55 mm thick. Supplied with two knobs and mounting hardware for back-to-back mounting. Extra long bolts for wooden doors; single-side bolts with end caps for single-side application (sold separately). Material: Stainless steel, 304 grade, brushed smooth surface for durability. Available finishes: Satin SS, Black Matte, and PVD Gold for both Square and Round knobs. Custom sizes and finishes for knobs and pull orders are available