Please 100% make sure that your grinder or polisher's spindle is 5/8"-11 Thread. (a) Angle Grinder 5/8"-11 Spanner Lock Nut & Backing Flange Set. Please make sure that your grinder's / polisher's spindle is 5/8"-11 thread. with this lock ring nut and wrench set, your 5/8"-11 spindle grinder / polisher can work with all 5/8" non-threaded abrasive tools. (b) 2 Pieces of 5" / 125 mm Diamond Turbo Row grinding cup wheel for stone concrete travertine masonry surface grinding / smoothing. It is non threaded, inner hole diameter is 7/8" to 5/8" (washer included). (c) 4inch or 5inch Dust Shroud Kit Fits All Major Brands Angle Grinders and Wet Polisher It's can Fit 4inch and 5inch For Wet Polisher And Angle Grinder. Fit just about any grinder / polisher including Makita, Hitachi, Bosch and more, with a collar diameter of 44mm -64mm. Install and remove in seconds with a simple hose clamp attachment. Three adjustable screws control height of the shroud allowing you to quickly change from cups to Velcro backed pads. The control springs also provide constant downward pressure between the shroud and the surface for maximum dust control. This shroud will accommodate 4" and 5" fittings.