• Best For: Floor-prep crews with an arbor-mount 4" grinder (7/8"-5/8") who want a double-row turbo cup wheel.
• Highlight: Double-row Supreme Grade turbo segments on a 4" (102mm) cup wheel supplied for the 7/8"-5/8" arbor rather than the threaded 5/8"-11 nut.
• Expert Note: Confirm your grinder's mount first: this arbor version is separate from the 5/8"-11 nut SG-2 (158689) and from the single-row 4" arbor CG-1 (158688).