Item # 597 -- 7" Aluminum Oxide Grinding and Cut Off Discs. 12 Blister Packs/Case with 2 Disks Per Pack with Arbor Assembly, Nut and Washer. Arbor – ½”. Medium Grit. RPM – 8500. Used on: Metal – Tile – Masonry – Wood - Laminates. Bullard Abrasives – Made in USA. New in box.