The hydraulic numbering unit can be used for stamping marks or codes in steel plates and fittings. Even after galvanizing or coating the steel, the numbers are very readable. The coat will be stamped approx. 1 mm into the......The hydraulic numbering unit can be used for stamping marks or codes in steel plates and fittings. Even after galvanizing or coating the steel, the numbers are very readable. The coat will be stamped approx. 1 mm into the material. Quick manual adjustment of the desired mark/number combination is possible with each code disc separately adjustable. After adjustment the set code can be easily read in the field of vision of the operator.