( 5/8"-11 female thread arbor, grinder's speed MUST be lower than 5000 RPM ). (b) 45 Pieces of 4" / 100mm Pad for granite marble concrete. MUST BE lower than 5000 RPM. Remind: The 5/8"-11 female thread arbor velcro backer/pad holder has water feed hole, can be used for wet polishing.
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