H6015 Bore Polisher Abrasive Type Coated Grit 80 Abrasive Material Aluminum Oxide Series R369 Backing Material Cotton/Polyester Backing Weight Y Compatible Bore Inner Diameter (Maximum) 1 in Compatible Bore Inner Diameter (Minimum) 5/8 in Maximum Operating Speed 25 000 RPM Compatible Mandrel Grainger Part Number 3RB56 Compatible Mandrel Manufacturer Model Number 08834154182 08834154460