4-1/2" Hub Grinding Disc : FLEX (FA303003) Grind and shave metal and make quick and easy disc changes with the FLEX 4-1/2" Hub Grinding Disc. This 4.5-inch grinding disc features a hub arbor design that allows the disc to be screwed on, eliminating the need for a locking nut. The disc's aluminum oxide grain delivers quick material removal without generating excessive heat for use with steel, stainless steel, non-ferrous metals, and cast iron. Its depressed center allows ample clearance when working at a constrained angle for shallow angle grinds. Its iron- and sulfur-free construction reduces oxidizable particles left behind on finished surfaces to help prevent rust, while a coating slows moisture exposure for extended disc life. Three full-face fabric layers hold this disc together for added stability and safety during use. Features: HUB ARBOR DESIGN — Allows disc to be screwed on, eliminating need for locking nut RIGID CONSTRUCTION — Three full-face fabric layers hold the disc together for added safety during use DEPRESSED CENTER — Allows for clearance when working at a constrained angle IRON- AND SULFUR-FREE CONSTRUCTION — Reduces oxidizable particles on finished surface to help prevent rust RESISTS MOISTURE — Disc coating slows moisture exposure for extended life ALUMINUM OXIDE GRAIN — Quickly removes material while maintaining reduced heat Specifications: Diameter (inch) — 4.5 Thickness (inch) — 0.28 Arbor Diameter (inch) — 5/8-11 Grit — Wheel Type — Grinding Disc Type — 27 MAX RPM — 13300 Max. Speed — 80m/s Material — Aluminum Oxide Set/Individual — Individual Package Quantity — 1 For Use With Angle Grinders — Yes For Use With Cut-Off Saws — No For Use With Chop Saws — No For Use On Metal — Yes For Use On Stainless Steel — No For Use On Masonry — No For Use On Concrete — No Includes: (1) 4.5" x 0.28" x 5/8"-11 Grinding Disc with Hub Type 27 [FA303003]