BlueFire Cloth File Belt, R823P, 1/2 in W x 18 in L, 80 Grit, Zirconia Alumina Engineered with a strong, self-sharpening zirconia alumina abrasive for fast and aggressive cutting Durable resin bond for excellent grain retention and product life Strong Y-weight polyester backing (R887D) for heavy-duty stock removal applications; flexible