Bore Polisher Abrasive Type Coated Grit 240 Abrasive Material Aluminum Oxide Series R369 Backing Material Cotton/Polyester Backing Weight Y Compatible Bore Inner Diameter (Maximum) 5 7/8 in Compatible Bore Inner Diameter (Minimum) 5 1/4 in Maximum Operating Speed 8 000 RPM Compatible Mandrel Grainger Part Number 34CC50 464P95 Compatible Mandrel Manufacturer Model Number 08834154184 08834154187