SIX Heavy Duty 4&rdquo; Concrete Turbo Diamond Grinding Cup Wheel for Angle Grinder 12 Segs High Diamond concentration for long life and aggressive material removal Suitable for use on grinding on marble, tile, concrete and rock. Large grinding segments with heat treated cup design Use Dry/Wet to smooth Concrete or Field Stone SIX Heavy Duty Contractor PRO Grade 4 Inch Grinding Cups