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IMPORTANT REMIND: The arbor is 5/8"-11 Threaded. NOT M14.

The 42 Pieces of 7 Inch / 180mm Rubber velcro backer is 5/8"-11 thread (NOT M14).

They are all with water feed hole.

Remind: Velcro Backer's max capacity is 5000RPM, please don't use it with high speed grinder/polisher.