2.3m,2.6m,2.9m,3.2m aluminuim portable folding telescopic ladder stairs 1.many ... .high qulity 4.low pr 2.3m,2.6m,2.9m,3.2m aluminuim portable folding telescopic ladder stairs 1. press ... as follows : meet EN131 standard . 2.3m,2.6m,2.9m,3.2m aluminuim portable folding telescopic ladder stairs