Stainless steel seamless pipe is a kind of long steel with hollow section and no seam around it. The thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the higher the processing cost. The technology of this product determines its limited performance. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low brightness inside and outside the pipe, high length cost, and pits and black spots inside and outside the pipe are not easy to remove; Its detection and shaping must be done offline. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.

Stainless steel lens barrel is a kind of lens barrel with bright surface and polished quality of "8K", which is often used for decoration.