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'' handle sold separately. No. 11642: Tapered hole No. 11643: Threaded hole