3M An aluminum oxide disc constructed on a film backing. Resin bonded for heat resistance. Tear resistant. Load resistant. Fast cutting. Long life. Consistent finish. Hook and Loop attachment for easy re-use. Constructed of durable aluminum oxide; works well for most wood species. The open coat feature provides a more aggressive cut than a comparable closed coat abrasive of the same grade and a special loading resistant coating makes this disc a good choice when loading is a problem. The flexible film backing provides a consistent finish and greater tear-resistance than a comparable paper product. Application: AOEM finish prep/repair, finishing, orbital sanding, paint/lacquer sanding. Attachment type: hookit. Coat type: open coat. Gold color. Converted form: hookit/hook and loop disc. Diameter: 3-inches. Equipment - machines: disc sanders, random orbital sanders. Grade: P320. Substrate: carbon steel, fiberglass, gelcoat, hardwood, paint, plastic, primer, softwood.