Reaming is used for final processing of holes after drilling, countersinking or boring. By rolling, a high level of accuracy and surface roughness is achieved. The high quality of processing is ensured by a large number of cutting edges and the removal of a small allowance. The reamer works during rotation and simultaneous translational movement along the axis of the hole. It allows you to remove a thin layer of material with high precision. In addition to cylindrical holes, conical holes are expanded with special conical reamers.