Al 7-08-03173-1 18" wire scrub brush with 2 metal lugs for american lincoln 772, sr9772, 7760, 7765 scrubbers. round wire brushes provide heavy duty scrubbing for problem flooring. special use brushes for removing heavy dirt and debris. brush has 9.5" center hole. 7760 and 7765 require 3 brushes. 772 and sr9772 require 4 brushes.