The Caral finishing set built-in thermostat 3-way gunmetal consists of:
a thermostat knob (hot/cold);
diverter buttons (e.g. hand shower/overhead shower and on/off);
a base plate.
For a Caral built-in shower tap installation set 3-way you need a Bit built-in part thermostatic tap 3-way. You can order these separately.