Item # 626 -- 7" Aluminum Oxide Grinding and Cut Off Discs. 80Bags/Case. 2 Disks Per Pack in Sealed Bag with Arbor Assembly, Nut and Washer. Arbor – ½”. Medium Grit. RPM – 8500. Used on: Metal – Tile – Masonry – Wood - Laminates. Bullard Abrasives – Made in USA.