Review on Versatile S SATC 5 Inch Sanding Discs 100PCS: Highly Efficient 60/80/120/150/220 Grits Gold Sanding Discs with Hook and Loop, Perfect for Orbital Sander - 8 Holes Sandpaper Included by Ken Pinell

I bought these discs after looking for discs for my Porter Cable 5 hole dust collector. With 8 holes on the rims I figured at least half would fit and everything would be fine. They will not align more than 1 1/2 holes resulting in insufficient dust pickup. Okay, that's my fault, but I bought other discs with the wrong number of holes (PC grinders are a weird design that you can hardly find discs for) and they worked acceptably as many of the holes matched enough to to function. But even with MANY holes it's not like I mentioned above. It's my fault for trying them even though I knew my grinders didn't have 8 holes. But to be honest I've never seen an 8 hole grinder this size. As far as I know, the discs are not standardized. But they are well made and hold up well. Only sometimes extra holes are attached to things and all the dust collection work is a mess, my workshop is full of dust.