1、[Versatile Function] This T square ruler combines drilling positioning guide and marking tool, serving as a T square or movable punching and marking device for various woodworking tasks. 2、[Metric and Inch Scale] With metric and inch dual scales, clear and easy to read, this T ruler ensures accurate measurements for precise woodworking projects. 3、[Interchangeable Drill Sleeves] Equipped with three sizes of drill sleeves (6mm, 8mm, 10mm, two of each), interchangeable, enabling quick and efficient switching between various drilling tasks. 4、[Aluminum Alloy Construction] Crafted from high grade aluminum alloy, this drilling positioning ruler features a robust structure designed to withstand the demands of frequent use. 5、[Consistent Accuracy] Whether marking precise measurements or drilling holes, this tool guarantees consistent and accurate results, ensuring reliable performance for all your woodworking needs.