Dust Collector Accessory Kit of Adapters Saw dust collector adapters for your workshop and vacuum hoses - 7 Adapters (NOTE- 2 Adapters come already connected together but come apart easily) Use one adapter by itself or try connecting some of the adapters to each other to create an adapter that will fit your hose.( the 4 x 2.5 and shop vac adapter will not attach to the other adapters) Dust Control for Woodworking - For use with your table saw dust collection system, router dust collection and other uses in your dust collector system. Shop vac reducer / Shop vac accessories 2 1/2 inch - One adapter that goes from 2.5 inch to 1.25 inch 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 measure your vacuum hose and attachment to check the size before you purchase because we want you to be happy with your purchase.