The 4-½’’x ¼’’ x 7/8’’ girding wheels from INGCO measure 4-1/2 inches in diameter, and 1/4 inches in thickness, and designed with a 7/8 inch arbor for secure installation. These high-performance grinding discs are ideal for stripping resin, cleaning, rust removal, grinding, dusting, deburring, polishing, and more. They’re also very effective for grinding metal. This disc runs at and operating speed of 13,300 RPM and 80M/S. Features: Depressed centre Grinding disc for metal 115×6.0x22.2mm or 4-½’’x ¼’’ x 7/8’’ Specification: 115mm(4-1/2")X6.0mm(1/4")X22.2mm(7/8") Depressed centre Grinding disc for metal Packed by label