Ranging from 40-120 grit, Trimmable Cyclone has composite backing that can be trimmed up to 3/8 in. from original dia. Operator can access hard-to-reach areas such as right angles and irregular shapes with extended flap length. Nonmarking backing will not damage workpiece. Made with zirconium abrasive grain, disc is available in 4.5 in. dia with 7/8 in. or 5/8-11 arbor.