To install the Ryobi Corner Cat you will need a hole punch to pin the top two holes in place and make an extra hole in place. Once that's done these pads work great, I think even better than the replacement pads I bought from Home Depot for a lot more money. I wouldn't try it without a hole punch, because if I didn't punch properly, the sawdust got in the way of the sand very quickly when I was sanding.
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