Niagara Machine has a great selection of DiamaPro Systems cup wheels for all your grinding needs. Available in 5" and 7" and in threaded and non-threaded, these contractor-approved cup wheels are high-quality, durable, and precisely designed. DiamaPro Systems diamond cup wheels have proven excellent for concrete preparation and coatings removal. We stock the complete line to assist in all applications, from the Continuous Rim Cup Wheel for Smoothing and Finishing concrete to the Star Segment Cup Wheel for opening concrete and heavy removal, we have a cup wheel for every job site requirement.