Segment Cup Grinding Wheel, Turbo, Number of Segments 18, Diameter 4 In., Arbor Size 5/8 In.-11, Abrasive Depth 0.2 In., Abrasive Material Diamond, Max. RPM 15, 000, For Concrete, Masonry and Stone Concrete and Tuck-Point GrindersDiamond Cup Grinding WheelsUse on concrete, masonry, stone, and similar materials. Turbo wheels provide a fast, smooth finish. Single row (rim) wheels are designed for fast removal. Double row (rim) wheels offer a smooth finish and longer life.