PFERD Arbor is intended specially for Arbors for POLIROLL cartridge rolls untampered and tapered POLIROLL cartridge rolls. POLIROLL cartridge rolls consist of a spiral-wound coated abrasive. The grit is embedded in a retinoid bond on the strong cloth backing material for maximum grinding effectiveness. The tool is held securely in place during grinding by a grooved conical arbor. 25000 Maximum RPM. 1/8-inches Pilot diameter. 1-1/2-inches Length. 1/4-inches Shank diameter.