Kethy BR310 Cylinder Shower Knob Cylinder Shower Knob is commonly used in modern bathrooms to easily control water temperature and flow. Cylinder Shower Knob Function - designed to control the water flow and temperature by rotating the knob to adjust the settings. Specifications: Material: Solid Stainless steel Available Size: 18mm 22mm Projection: 24mm Function: Back To Back Washers and Fittings for 6mm - 10mm Glass: Included Available Finish: Polished Stainless Steel ??????? Satin Stainless Steel Sold as Pair Note: The screw depth on Kethy handles can vary depending on the design, Most knobs and handles have sufficient thread depth to allow a 22mm or 25mm screw to fix to either 16mm or 18mm doors or drawers. Knobs and handles are supplied with the correct screw for these thicknesses depending on the handle. Longer screws can be supplied upon request, up to 50mm long.