1. **Multiple Functions** – This adapter enables precise and fast drilling of square holes for woodworking, furniture making, and other DIY projects. Compatible with both column drills and hand drills, it supports clamping diameters ranging from 1.5 to 2.2 inches. 2. **Easy Installation** – Featuring a base with a reading function, this adapter ensures simple installation and safe operation during any drilling motion. The large handle provides a comfortable grip, while allowing precise angle cuts from 45 to 90 degrees. 3. ** Materials** – Crafted from wearresistant metal and pure copper, this square hole drill adapter is durable, resistant to breakage or deformation, and boasts exceptional strength. 4. ** Design** – The adapter's precision design ensures smooth transitions between different drilling tools. Whether using bench drills or hand drills, it facilitates effortless and accurate drilling of straight or angled holes in boards and logs. Its controlled operation guarantees smooth drilling for diverse applications.