Simply tie it 4 times and you're done. 70% time saving during assembly. The wings make it easy to maintain a standard distance of 15 cm from the door formwork. The boxes can be combined, and the SCS technology means that an absolutely solid connection can be made. Suitable for concrete ceilings from 20 - 60 mm. Suitable for pipe entry 2x M32 and 4x M20/M25 or 6x M20/M25.