TRIPLE Brush Boxes are made up of three individual brush boxes which push together, heights start from 60 cm upwards. The front two boxes are 18" depth and the third box is 6" depth box 3 will have a bracket on to hook over the back of box 2 THESE BOXES ARE QUITE HEAVY ADD AS MANY BOXES AS YOU LIKE!! MEDIUM BRUSH USED UNLESS FIRM OR SOFT IS SPECIFICALLY REQUESTED