Grind efficiently with this Metal R828 coarse grit arbor thread fiberglass flat flap disc, which works well for coarse grit blending, stock removal and deburring on a range of metals, including many metals, stainless and super alloys. The Type 27 disc features a standard zirconia grain and polyester/cotton flaps for excellent cutting, blending and smooth finishing. Designed to be used at a 0 to 15 degree angle on flat surfaces, the disc has fiberglass and resin backing plates that provide high strength at a light weight. The disc delivers great vibration-absorption for comfortable operation.