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Standard Abrasives 645879 HP Type 27 high density flap disc uses A/Z alumina zirconia AZ as the abrasive material and has a diameter of 7 in. Standard Abrasives incorporates this A/Z alumina zirconia AZ material into the high density flap disc forming a grit of 60. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This Standard Abrasives high density flap disc can be run at a maximum speed of 8600 RPMs.