Seamless steel tubes, precision and restricted dimensional tolerances. The applications are determined by the specific characteristics of these tubes: - High dimensional accuracy of internal and external diameters. Smooth-surface due to the process of wire drawing. - Mechanical properties defined, resulting from cold deformation. - Range dimensional strictly staggered. They may also be provided in the BK (without heat treatment after the last training cold), BKW (small wire pass after the last treatment), GBK (annealing in controlled atmosphere) and NBK (normalized in a controlled atmosphere)