By using controlled pressure it is possible to use just one stone grit for polishing and honing. Stones are square end to hone to the end of step-cut end blind-end cylinders. 2 stones, 1 1/8\" long, 240 grit; Adjustable range 11/16\" to 2 1/2\" (17.4mm to 63.5mm); Note: See 530701 for replacement stone set