We have taken out two patents:

• The first regards the height adjustment and pressure of spiral staircases through a threaded ring placed at the base of the steel pipe of the staircases.
• The second solves the anchorage and processing assembly of the railings and the structures of self supporting staircases, giving the possibility to insert wooden plugs and fixing screws that remain out of sight. The result is perfect because it’s impossible to see the screws and the junctions have an excellent hold.

The quality of this system has been certificated by CATAS (Italian Research and Certification Institute and test Laboratory in the wood and furniture field).