... spark perforator / broken screw extractor / / remove broken taps, screws, bolts out of machine Description:1. A tool for forcing a pin, bolt ... in machine or metal sheet without any damage to the workpieces 3. Processing ordinary metal and cemented carbide, making small holes, irregular ... breaking screw taps in metal holes without any damage to the workpieces. 5. Make letters in roll or other metals. ...