These Punches are drilled, turned, and then individually brazed to provide the best quality point for carving Stone. The Tip is selected from varying grades of carbide, to increase the strength the larger the tool. If you intend using it for heavy duty stone work, choose 3/4" or 7/8". For softer stone and more detailed work, chooses from either of the smaller sizes, 1/2" or 5/8".