Mercer Industries 342T060 Standard Type 29, 4-1/2"x 5/8"-11 Grit 60 Zirconia Flap Disc Trimmable (10 Pack) High quality zirconia grain features a resin on resin bond Cool cutting and resistant to heat and moisture Does the job of a grinding wheel and a fiber disc Type 29, 4-1/2-Inch x 5/8-Inch-11, Grit 60, 10pk Trimmable plastic backing extends the life of the disc, is lightweight, and is cost effective