A steel structure adapted for the reinforcement of elastomers, said steel reinforcement comprising one or more steel filaments (10). At least one of said steel filaments (10) is provided with a first crimp and a second crimp. The first crimp lies in a plane that is substantially different from the plane of the second crimp. Applying both crimps can be done in an efficient way by means of two pairs (12, 14) of toothed wheels which are not externally driven. By means of these crimps it is possible to obtain steel structures with an increased penetration of rubber or with an increased elongation at break.