2-piece Cut-Off Disk Set is a must-have for every tool box. Saves time and frustration when other tools are too slow or simply fail altogether. Set includes one each .866" (approx. 7/8") and .944" (approx. 1") hard aluminum oxide disks for steel, cast iron and all types of metal. Use with #87506 Mandrel with 3/32" shank (available separately).