Dremel Ultra-Saw Metal Cutting Wheel 3-1/2 *Sub Brand: Ultra-Saw *Product Type: Metal Cutting Wheel *Diameter: 3-1/2 in. *Thickness: .049 in. thick *Compatibility: RotoZip and ZipMate *Maximum Speed: 20,000 rpm *Grit: 60 Grit *Abrasive Material: Aluminum Oxide *Abrasive material for high performance metal cutting applications *Cuts ferrous and nonferrous materials *Discovery CON, NBR, SUP