Ideal for light grinding and blending applications on a variety of materials. Abrasive grains are fused directly onto a wearable polymer backing, resulting in a disc that requires no back-up pad. Designed for use on right angle air die grinders. Ideal for Light Grinding and Blending Applications on a Variety of Materials. Abrasive Grains are Fused Directly Onto a Wearable Polymer Backing, Resulting in a Disc That Requires No Back-Up Pad.