5" Hard Bond Reaper Cup, Diamond Cup Wheel for Concrete

The 5" Hard Bond Reaper Cup is a segmented diamond cup wheel for concrete grinding on an angle grinder. Use it to strip coatings, mastic and adhesive, take down high spots and open the surface for a new floor coating. Available in 6, 16 and 30 grit.

A hard bond is made for soft or green concrete and abrasive overlays. The tougher matrix holds its diamonds longer against surfaces that would wear a softer wheel down fast. On hard, dense concrete it can glaze and stop cutting; choose a softer bond there.

Run it on a grinder with a 5/8-11 spindle, under a dust shroud connected to an industrial dust extractor.

• Diameter: 5" (125 mm)
• Segments: 12, 6 mm segment height
• Arbor: 5/8-11 threaded
• Max speed: 12,000 RPM
• Bond: hard, suited to soft or green concrete and abrasive overlays
• Grits: 6, 16 and 30 (marked HB 6#, 16# and 30#)
• Weight: about 543 g

Choosing a grit

• 6 grit: the most aggressive cut, for coating, mastic and adhesive removal.
• 16 grit: general grinding and profiling, or cleaning up after a 6 grit pass.
• 30 grit: a finer scratch for smoothing the surface before coating.