3M SandBlaster Quick Change Hub for Right Angle Grinder, 4.5 in.
Quick change hub adapter for right angle grinder, fits 4.5" and 5" right angle grinders with a 5/8"-11 thread per inch external shaft size, attaches easily, spin on/off, changes discs quickly, attach a variety of versatile grinding, sanding, and finishing discs without the need for wrenches, provides support while also allowing some flexibility to finish contoured or curved surfaces.