Seamless steel pipes with small outer diameters can be called small-diameter seamless steel pipes. Small-diameter seamless steel pipes can also be divided into: seamless small-diameter steel pipes and straight seam (also called welded) small-diameter seamless steel pipes. the outer diameter of the steel pipe is 89mm or less, 4mm or more; all can be collectively referred to as small-diameter seamless steel pipe.
Thickness: 0.1mm-50mm, or as your requirements

Outer Diameter: 10mm-1500mm, or as your requirements

Length: 1000-12000mm, or as your requirements