Dust Collector Accessory Kit of Adapters 5 Pieces - Saw dust collector adapters for your workshop and vacuum hoses Dust Control for Woodworking - 4" to 2.5" reducer. For use with your table saw dust collection system, router dust collection and other uses in your dust collector system. also to use as a Shop vac reducer / Shop vac accessories 2 1/2 inch - One adapter that goes from 2.5 inch to 1.25 inch and one adapter that goes from 2.5 in to 1.5 in You can connect your existing 1.25" Inch or 1.5" Inch vacuum accessories to your 2.5" Inch shop vac. Or connect your shop vac dust collection hose to the dust port on your table saw or other piece of wood working equipment. Also, you get 2 of our rubber adapters for even more options in your dust collection system or just to use as a stand alone adapter. ( see photos for dimensions) Use these shop dust collection fittings to connect your power tools vacuum port to your hose in your work shop or with your shop vacuums and with dust collection systems. PLEASE CHECK THE DIMENSIONS OF THE ADAPTERS BEFORE YOU PURCHASE TO ENSURE THAT THESE WILL FIT YOUR CONNECTIONS. Dimensions are in the photos. Three adapters are made from strong durable plastic, the ends are tapered for a snug fit and 2 are rubber. Connect your shop vac to any vacuum accessory with a 1.25" or 1.5" Inch hose or extension. Use the strong suction of your shop vac car detailing attachments to clean like never before. This can also be combined with your shop vac hose extension. Together these adapters will allow you to connect more accessories and attachments to your shop vac.