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

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The 7 Inch / 180mm diameter velcro backer's arbor is 5/8"-11 female thread (NOT M14).

They are all with water feed hole.

and 1 Piece of 3/8"(10mm) Diameter round shank adapter (you can connect the backing plate to your electric drill).

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