Sungold Abrasives 20-70521 5-Inch x No Hole PSA Back-Up Pad for Glass, Stone or Marble Type F Low Profile M-8 Metric Thread Type F Low Profile Pad. Firmer. Best Suited for flat surfaces M-8 Metric thread attaches to Makita GV5000 and GV5010 Sanders. Can be used for full grit range. Best suited for 120 and coarser For 150 and finer can use Type G Sun gold Part Number 20-70522