Cold Drawn free cutting steel bar 11SMNPB30/37 DIN 1651 Our order for 9SMnPb36K or 28K is" Round=(5-10mm) and (11-40mm) Hexagonal= (5-40mm) Squares= (5-10mm) and (10-30mm) The length: 3m. About Tolerance: The tolerance of the length must be -0+5% and Tolerance of the wide must be the same as h8 or h9 in DIN.