This is an adapter for the DWE575DC dust collector for the DWE575 circular saw to fit a 2.5 inch Ridgid workshop vacuum. The fit on the Dewalt adapter side is a bit loose because the DWE575DC is odd. Use 1-2 layers of masking tape to tighten it. Update 17.05.21: The product has been made thicker to withstand physical stress.