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The Lhr21 Mark Iii Random Orbital Polisher Comes With A 6-Inch Backing Plate And Should Be Used With Rupes 7" Or 6.75" Pads. The Rupes 6" (150mm) Velcro Grip Multi-Hole Direct Flow Backup Pad (981.321n) Is Recommended For Use With All Lhr21 Bigfoot Polishers. The Backing Plate Is Made Of Polyurethane Foam That Is Resistant To Mechanical Stress. When Used With Bigfoot Polishing Foams, The Backing Plate Reduces Vibration.When Choosing A Backing Pad, You Can Also Consider The Type Of Foam Used To Make The Polishing Pad