Acid brushes offer high fluid retention and are densely packed in a hardwood block with tapered or threaded handle holes. Heavily filled with white tampico fibers, acid scrubs can be used by hand or with a handle for scrubbing brick or masonry. 8" x 1-1/16" trim. Handles model No. 748 tapered or 11022 threaded 72" handle or model No. 354 threaded 54" handlesold separately.