Replacement Ceramic Disc Stem Cartridge Faucet Valve Quarter turn PAIR 1/2" X 53mm x 12mm spline length 20 teeth NPT 1/2" ceramic faucet valve with 20 teeth on the spline (stem of valve). Brass M4 screw included Please check the dimensions in the diagram carefully before purchasing You will receive one PAIR of valves (one Anticlockwise and one clockwise) Can't find the right size? Contact us for advice - We are available for Technical help and support FAST DESPATCH - Delivery aim from the UK to USA takes 5 - 7 working days