7" 18 Segment Premium Spiral Bi-Turbo Cup Wheel (#120/140 Grit) Part Number: CW7BT99120SDN Size: 7 18 Seg #120/140 Grit Premium Spiral Bi-Turbo Cup Wheel This cup wheel is most commonly used on the TC-7 Edge Grinder (SX67000) as the last "metal" step before switching to resin pads for polishing concrete