Under the normal table top can be mounted a second plate, which can be rotated out if necessary. With locking mechanism. Ideal for a base plate up to 100 x 50 cm and a rotating plate up to approx. 50 x 70 cm (dimension depends on free space). Height to lower edge of upper table top 700 mm. Height with lower part removed is 313 mm. Locking points at 0°, 135°, 180° and 225°.