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The quality of metal used for the production of feet determines the long-term and proper working and affects the quality of the stitching.
Quality confirmed by hardness certificate
Hardness certificate made in the Laboratory of Special Tools Factory in Poznan (certificate No. 58/13)
Foot P36L Quality Line
Hardness measured: 48-50 HRC
Foot P36L from another producent
Hardness measured: 20-25 HRC
Test carried out by hardness testing machines: PW-106. The result given in the Rockwell scale of hardened steel (HRC). The hardest hardened steel has a hardness of 65-70 HRC.