* Description: The roller reamer (drilling reamer) is used for all kinds of reaming stabilization in drilling operation, especially the function of stabilization in drilling of the abrasive formation. It is a hot-sale tool for hole size from 4 5/8 to 26. Additionally, it can be used in different hole when same body is equipped with different bearing block and rollers. * Feature: a. The body is made of high quality alloy steel, fully heat treated to 285-341brinell hardness and 54J minimum impact strength. b. Rollers can be changed easily at the well.