Drill! Just make sure you have the appropriate compressor. It needs weight to work. If you have a 5kg or 6kg one, it does the job, just be careful with the eyes of the tool - compressor. Besides, the 6kg ones go up to 40mm. I bought it for use on concrete, to drill holes about 6 centimeters deep for lighting fixtures. If it comes across iron... hehe, it needs Hulk's hands or else the compressor, its chestnut, will crack. It doesn't cut iron. So if you find iron, let's go somewhere else.