Cal-Van Tools 762 Sub Compact Brake Cylinder Hone Recommended for cylinder bores 1/2-in to 2-1/4-in (13mm-57mm) diameters Offers fast easy cutting with high or low speed drills Self aligning and self centering Flex joint drive with adjustable tension Includes: Two(2) 1-1/8-in (29mm) Med Grit Stones