The black, industrial strength, long-wearing polyester fill is water-resistant and resists high temperatures, acids, alkalis and most cleaning solutions, according to Flo-Pac. The uneven polyester trim gets into grout lines, uneven surfaces and can be used on floors, tubs, siding and other surfaces. The lock-down collar securely holds the 15/16-inch threaded handle available separately. Circle 235 on the Reader Inquiry Card.