Feature: 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. Specification: Item Type: Woodworking T Square Ruler Material: Aluminum alloy Size: Approx. 50cm / 19.69in Drill Sleeve: Approx. 6mm / 0.24in, 8mm / 0.31in, 10mm / 0.39in. Package List: 1 x Woodworking T Square Ruler 1 x Fixed Ruler Seat 6 x Drill Sleeves 4 x Screws 1 x Wrench