finishing tool 100 with a body 102 that is hollow and generally tubular fig1 a presents the same surface finishing tool 100 in cross section with the view taken across line 1 a u2014 1 a of fig1 the central body 102 has a plurality of recesses 114 to hold a respective extendable assembly 110 each of the recesses 114 has substantially parallel sides and holds a respective piston 120 the pistons 120 are radially slidable one piston 120 being slidably sealed within each recess 114 the backside of each piston 120 is exposed to the pressure of fluid within a hollow bore 115 of the surface finishing tool 100 in this manner pressurized fluid provided from the surface of the well can actuate the pistons 120 and cause them to extend outwardly disposed above each piston 120 is a roller 116 in one embodiment of the surface finishing tool 100 the rollers 116 are near cylindrical and slightly barreled each of the rollers 116 is supported by a shaft 118 at each end of the respective roller 116 for rotation about a respective axis the rollers 116 are generally parallel to the longitudinal axis of the tool 100 in the arrangement of fig1 the plurality of rollers 116.