The CP7120 2 In. 1 is a heavy-duty needle scaler/chisel. It has 4600 blows per minute, adjustable sleeve for job specific requirements, and high wear resistant steel needles. This dependable tool for all surface preparation needs involving cleaning or removal of paint, rust, dirt, or weld slag. The tool can easily convert from a needle scaler to a chisel scaler. Needle scaler stroke length: 1-1/8, blows per minute: 4600, needle size diameter: 1/8.