Total height:45mm/1.77 inch;Width:23mm/0.91 inch;Waist to base distance:24mm/0.94 inch. Spline diameter:8.2mm/0.32 inch;Number of teeth on spline:20/0.79 inch;Base diameter:18mm/0.71 inch. Waist diameter:23mm/0.91 inch;Turn on:Counterclockwise;Turn off:clockwise. 1/2 inch thread. Rubber O ring at the bottom The discs are made of copper and ceramic Both discs are suitable for both hot and cold water fit most UK double handles kitchen and bathroom basin taps 20 teeth on spline which is also drilled and threaded to fit for a 4mm screw Red colour rubber disc valve is turning clockwise for tap on and, turning anti-clockwise for tap off. This valve with red rubber O ring is usually used on the right hand side Blue colour rubber disc valve is turning anti-clockwise for tap on and, turning clockwise for tap off. This valve with blue rubber O ring is usually used on the left hand side. material:copper colour: red or blue, sent by random Package included:4 x 1/2 inch copper Ceramic Disc valve left side 4 x 1/2 inch copper Ceramic Disc valve right side Note: Random color, don't accept the specified color. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.