Weiler 07769 Adapter, 5/8"-11 Unc To 3/8"-16" - For Use With Mounting Brushes with a 5/8"-11 UNC Nut to other Threaded Spindles Engineered and manufactured to maximize performance and minimize operating costs. The use of superior construction, the highest quality materials and the most stringent manufacturing processes deliver the lowest cost-of-use and most consistent performance.