4.5" x 7/8" Premium Zirconia Flap Disc Grinding Wheel 60 Grit Type 29-10 Pack Benchmark Abrasives uses only the highest quality grains and backing material for our flap discs. Designed for grinding, blending and finishing on a wide range of metal. The #1 choice for welders and metal fabricators. Made in accordance with ANSI safety requirements. For use on an Angle Grinder.