Dust extraction Hookit™ back up pad (Clean Sanding) is constructed on foam material. The backup pad itself has a 5/16-24 internal thread, and the kit includes five adaptors that convert it to 1/4-20 external threads, 1/4-20 internal threads, 1/4-28 external threads, 5/16-24 external threads, or 6mm-1.0 external threads.
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