Use this brush to clean any type of deep vessel. Good for restaurant kitchens, laboratories with round-bottom flasks, repair shops, any facility needing dexterity and small size in the cleaning head. Diameter of wooden head: 1.7025 x .8915" and the bristles are 1.578 x.74". Head of brush swivels, reaching intricate curves and corners. Natural bristles set in wood will not scrape cleaned surface. Head fits into any container with a neck diameter of 24mm (1") or more. 33cm (13") hardwood handle. Per each.