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Similar to the rotary hammer drill but larger, they are connected to a pneumatic hammer that, by using compressed air from a compressor, makes a continuous drumming on the bush hammer's head. This way different finishes are obtained just by changing the bush hammer. Its head is usually 40x40 or 45x45 mm, with notches in rows of 4x4 or 11x11. There is another type of bush hammer with a head made of sharp laminas called a grinding burr.
The true function of these tools is to prepare the surface for polishing although nowadays, they are used to imitate the cut achieved by the manual bush hammer or grinding burr.
