Libman 10in x 3.5in floor scrub head is the ideal heavy-duty cleaning tool. Stapled fibers are non-flagged and stiff to get hard to remove debris from cracks and all surface types, including grout lines in restroom tiles. The poly block has a molded-in scraper edge. Excellent for multi-surface applications, from smooth to semi-rough and varied surfaces. Scrub head block can accept any standard threaded handle. Scrub head only.