Honing tube refers to the hydraulic system. The standard of the fluid tube in the domestic national standard is GB3639-83. The precision dimension of the hydraulic equipment is high and the surface finish is cold drawn or cold rolled precision seamless steel pipe. Precision seamless steel pipe is used to manufacture mechanical structure or hydraulic equipment, etc. A high-precision seamless steel pipe after precision steel pipe is processed by cold drawing or cold rolling. Because the inner and outer walls of the precision steel pipe have no oxide layer, withstand high pressure without leakage, high precision, high finish, no deformation during cold bending, flaring, and flattening without cracks, they are mainly used to produce pneumatic or hydraulic products.