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4. For masonry, use carbide-tipped bits or masonry bits. A smooth even flow of dust indicates the proper drilling rate. Chipping and Chiselling 1. To switch from hammer drilling to chiselling, first insert the SDS- plus® chisel and check if it is properly locked. 2. When switching from hammer drilling mode to chiselling mode, turn the chisel to the desired position. If you find resistance during mode change, turn the chisel slightly to engage the spindle lock. Depth Rod (Fig. 4) TO ADJUST THE DE