IVY Classic 42201 Flex-Abrasive 4-Inch x 5/8-Inch 60 Grit Coarse Zirconia Flap Disc For metal and stainless steel fabrication, blending welds, deburring, cleaning, stripping and finishing, Flex-Abrasive (Registered Trademark) Combines grinding capabilities of a depressed center wheel and finishing characteristics of a fiber disc thereby eliminating the switching of tools Type 29 angled design works at 10 to 25-degree angle, use with angle grinder Zirconia alumina discs last 20x longer and remove material 3x faster than resin discs Disc Diameter: 4-Inch, Arbor: 5/8-Inch, Grit: 60 - Coarse, Max RPM: 15300