DescriptionChrome temperature dial-replacement knob for steam and shower mixer valves or faucets as featured on this website. Suitable for Insignia, Aqualuss Opus & Alto, Vidalux, Lisna Waters, Bathtek, Brownes, Aquaplus and many more2.5mm Alun grub screw includedMeasurements :Overall Diameter: 50mmDepth: 40mmFits Spindle Diameter: 8.5mmFits Spindle: 24TTThis knob/dial is for the bottom of the three dials that control the temperature on a 3 dial shower mixer valve.