Small diameter precision tubes are small diameter seamless tubes with high dimensional accuracy and good surface finish used in mechanical structures and hydraulic equipment. Selection of precision seamless tubes for the manufacture of mechanical structures or hydraulic equipment, etc., can greatly save machining man-hours, improve material utilization, and at the same time help to improve product quality. Small-diameter seamless tubes are rolled in a ring-shaped hole pattern consisting of a variable-section round hole slot and an immovable tapered top head,? Cold drawing is usually carried out on single-chain or double-chain cold drawing machines,? Extrusion method is to put the heated billet in a closed extrusion cylinder perforated rod and extrusion rod together with the movement,? So that the extruded parts from the smaller die hole extrusion,? This method can produce smaller diameter steel pipe.