Concrete floor grinders use horizontally rotating discs to level, smooth, or clean the top surface of a concrete slab. Strip-serts, grinding stones, or scarifier assembly to remove rough finishes, flatten uneven areas or clean concrete slabs of sealers, paints or mastics. Grinders can also be used effectively to level uneven joints or high spots of 1/16 to 1/8 inch. single, dual, four or turbo grinders provides contractors with a smoother finish than scarifiers or scabblers.