Draper 51mm 177mm cylinder hone draper 56250 the draper 51 177mm cylinder hone 120 grit stone set is for use on small bore cylinders ie motor cycles etc with capacities between 51 and 177mm the flexible drive shaft allows easy alignment whilst working with the honing pressure adjustable to suit the particular application suitable for use with an electric or air drill draper 56250 51mm 177mm cylinder hone 120 grit stone set