FLEXIBLE RUBBER IRIS ADJUSTS to 1/4" through 2-1/2" openings ATTACHES TO 2-1/2" shop vacuum hose or 2-1/2" dust collection hose FEATURES A RATCHETING LOCKING RING with flexible rubber grip that allows you to attach most sizes and shapes of vacuum ports to your shop vac ADAPTS TO MOST portable equipment like routers, sanders, and miter saws Tired of making multiple trips to the store to find that special fitting for the dust port of your portable equipment? Try this universal adapter that features a ratcheting locking ring with flexible rubber grip that allows you to attach most sizes and shapes of vacuum ports to your shop vac. Adapts to most portable equipment like routers, sanders, and miter saws. The fixed end attaches to 2-1/2" shop vacuum hose or dust collection hose.Flexible rubber iris adjusts to 1/4" through 2-1/2" openings.