This vacuum dusting brush has an internal diameter of 45 mm and connects to the end of a 38mm Vacuum hose cuff. It has synthetic brushes and has been designed to clean around machinery, grills, and vents when connected to the end of the hose. It is excellent for scrubbing uneven surfaces.45mm Neck ID | Suits 38mm Hose Cuff | Synthetic BristlesProduct SKU: ACC004