The newest bush hammer roller is designed to be used on Angle Grinder, for making scratching finish on Granite/Marble/other Stones. This bush hammer roller is specially designed for scratching different stones on Angle Grinders. The width between each bush hammer head is 2.5mm, and the function part can be Carbide or PCD. Carbide is used for bush-hammering soft stones, such as marble, etc. PCD is used for grinding hard stones like granite. Compared to the old version, this newest bush hammer is upgraded on three things: 1. Increased the strength of bush hammer head The bush hammer head is changed from steel to stainless steel. 2. Increased duct-proof performance The new bolt matched with the head closer 3. Reduced the total weight The total weight is reduced from 4.4kg to 3.8kg, which can reduce power consumption and is better for operating. Sunny Superhard Tools provides you the best bush hammer tools with high quality and competitive prices. Chek our demonstation of this scratching roller as follows: BHR8-C2BHR3