Features 1、[Versatile Design] This T square ruler combines drilling positioning guide and marking tool, serving as a T square or movable punching and marking device for woodworking tasks. 2、[Dual Scale] Equipped with clear and easy to read metric and inch scales, this tool ensures precise measurements for accuracy and efficiency in your projects. 3、[Interchangeable Drill Sleeves] Featuring three sizes of drill sleeves (6mm, 8mm, 10mm) that are interchangeable, allowing for quick and easy switching between different drilling tasks. 4、[Aluminum Construction] Crafted from premium aluminum alloy, this drilling positioning marking ruler boasts a sturdy structure capable of withstanding frequent use. 5、[Consistent Results] Whether marking precise measurements or drilling holes, this tool guarantees consistent and accurate results to meet your woodworking needs. Specification Item Type: T Square Ruler Material: Aluminum alloy Size: Approx. 30cm / 11.81in Drill Sleeve: Approx. 6mm / 0.24in, 8mm / 0.31in, 10mm / 0.39in Package List 1 x T Square Ruler 1 x Fixed Holder 3 x Drill Sleeves 4 x Screws 1 x Wrench