Features Efficient Cooling with Air Holes: The concrete grinding wheel features air holes that maintain and cool the cutting pattern, reducing wear and ensuring efficient performance. High Hardness and Wear Resistance: Crafted from high-quality diamond material, this turbo diamond grinding wheel offers exceptional hardness and wear resistance, ensuring long-lasting grinding capabilities. Versatile Application: Suitable for polishing and grinding various materials, including granite, cement, marble, rock, masonry, and concrete, providing a versatile solution for different projects. Enhanced Durability with Large Segments: Equipped with large grinding segments and a heat-treated steel body, the diamond grinding cup wheel offers increased durability and longevity. 12-Segment Teeth Design: The 12-segment diamond grinding disc allows for dry and wet grinding, effectively processing uneven s with professional results. Features: 1、High-speed revolution, high accuracy. 2、High concentricity, small manufacturing tolerance, effectively helping extend drill bit life. 3、Can greatly improve drilling efficiency. 4、Precision ground and hardened steel construction. 5、Fine workmanship, high reliability, long service life. Specification: Item Type: Outside Cooling Hollow Drill Bit Connecting Rod Material: C45 Clamping Size: 19.05mm (3/4inch) Cutting Depth: 50mm / 1.98in Total Length: 158mm / 6.22in Weight: Approx 480g Package List: 1 x MT2 Connecting Rod 1 x 5mm Hex Wrench Package List 1 x MT2 Connecting Rod 1 x 5mm Hex Wrench