Features a graduated adjustment dial for fast, accurate bore sizing. Cylinder hone holds diameter, taper and roundness. Ideal for correcting tapered, out-of-round cylinders and enlarging cylinders for oversized piston and ring assemblies. Removes 0.003” (.076mm) of stock or more per minute. Use with a 1/2” capacity, heavy duty drill. Range: 2-1/2”-4-1/8” (63.5-105mm). Includes hone body, No. 619 roughing stones, No. 620 medium stones, drive shank, drive shank extension, stone retainer springs (2) and a metal storage box.