63mm (2-1/2″) Low Profile Dust port directly accepts a standard 2 ” Shop-Vac hose end in the dust port opening. You can also attach a standard 63mm (2-1/2″) dust collection hose around the outside of the dust port opening with a single hose clamp. The fitting itself attaches to the back of most router fences with two standard wood screws. The low profile makes this fitting an excellent add-on to any drill press fence system.