• Best For: Floor-prep crews with a 4" grinder that has a 5/8"-11 threaded spindle and who want a single-row turbo cup wheel.
• Highlight: Single-row turbo segments in the Supreme Grade MK-504CG-1 series at 4" (102mm), threaded 5/8"-11 so it spins straight onto the spindle.
• Expert Note: Pick this 5/8"-11 nut version only if your grinder is threaded; the 7/8"-5/8" arbor version of the same 4" wheel is 158688, and the 4-1/2" size is 158699.