• Best For: Floor-prep crews running a 4-1/2" grinder with a 5/8"-11 threaded spindle who want a single-row cup wheel.
• Highlight: A 4-1/2" (114mm) diameter gives a wider cutting ring than the 4" (102mm) MK-504CG-1, in the same single-row Supreme Grade turbo design.
• Expert Note: Size matters here: this is the 4-1/2" wheel on a 5/8"-11 nut; the 4" nut version is 158687, and the 4-1/2" double-row version is 158700.