Features and Benefits: For any type and size of cylinder the FLEX-HONE process (Super finishing) produces a controlled surface condition unobtainable by any other method. It involves finish geometry and metallurgical structure. A high percentage plateau free of cut torn and folded metal (with radiused ports). A resilient flexible honing tool with a soft cutting action. The abrasive (points) globules each have independent suspension that assures the Flex-Hone to be self-center. lT15 TORX power bit x 3-1/2 in.; In general when operating always have the tool rotating before entering the bore and direction of revolutions should not change while inside the piece. To avoid damage to the tool and maintain operation safety do not run the tool at high speeds while unsupported outside of the intended bore. Do not apply a side load to the shank or stem and do not exceed manufacturer s recommendation for speed of rotation. Speed should be reduced on entry and exit of the intended bore to avoid any oscillation which may compromise the integrity of the shank or stem. Always use with ample lubricant or honing oil do not use solvents. Brush Research 1 3/8 in. 180 Grit Flex Brake Cylinder Hone (BRMBC1-38) Category: Cylinder and Piston Tools.