About the product (source Boels) : FeaturesBetween storeys, with units, to (system) scaffolding, formwork walls, etc.Stairs with 24 steps or more must be fitted with a combination beam (14848/14849)Flights of stairs with 18 and 21 steps must have a universal support.Flights of stairs can be joined together.Meets the EN-128811 standard for temporary building site equipment. (…) Make a request to dispose of the rental price.