Suction comes from your shop vacuum, so all you have is all you get. But with sufficient suction power (from a 5hp handyman vacuum in my case), this attachment does a pretty good job of picking up sawdust from uneven surfaces like my 1/2″ thick textured rubber floor. The bristles are stiff enough that you can brush a little to knock out somewhat stubborn pockets; The ones you can't free are where those stray blobs of glue ended up. I would buy another.
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