Powerbuilt 3 Arm Disc Brake Cylinder Hone 1-1/4″ to 3-1/2″ – 648631 (Black). Makes it easy to hone caliper piston cylinders from 1-1/4-inch to 3-1/2-inch diameter Self-aligning and self-centering designFlexible shaft with adjustable tension for use on or off the carIncludes #220 medium grit stones, 2-inch lengthUse with any 3/8-in drillReplacement stones available While we aim to supply accurate product information, it is sourced by manufacturers, suppliers and marketplace sellers, and has not been provided by Overstock.