i was hesitant to buy this Industrial and Scientific product but I'm glad I did. My analysis of this product showed that it allows for precise drilling in hardwood without any splitting or cracking. The countersink is fully adjustable, making it perfect for any size screw or bolt. The only con is that it can be difficult to adjust for beginners, but once you get the hang of it, it's perfect. Highly recommended for any woodworking enthusiast!