Smooth swivel fittings rotate 360 to help you avoid kinked and coiled hoses. Simply attach to your shop vac or dust collector and any 2-1/2 hose with Bridge Hose Clamps (sold separately) to make dust collection and shop cleanup more convenient.Additional features:* Made of durable ABS plastic * The larger OD on the swivel fittings is 2-1/2. This fits inside 2-1/2 standard or Dust Right hoses and then is clamped in place. NOTE: Shop Vac hose does not fit inside this end. * The smaller OD on the swivel fittings is 2-1/4. This is a standard Shop Vac fitting so this OD fits inside the open port in standard Shop Vacs.