Versatile device: Use the hole ruler to meet your woodworking needs. With flat edges and clear scales on both sides of the T-ruler, it can be used for drilling, marking and measuring. Simple and precise: Our hole ruler uses a sliding design and adjustable size function to precise and consistent marking every time, making it an easy-to-use and efficient tool for hobbyists and professionals. Sturdy and : This hole ruler is machined from aluminum alloy and anodized for extreme durability and precision. The engraved scale ensures accurate measurements for daily or professional applications, making it a safe and long-lasting choice. Easy adjustment: Our hole ruler provides precise measurements for woodworking and construction, while also providing practical tools for calibration and strong locking. The bottom is equipped with a high-precision bubble level to help calibrate the horizontal and vertical positions, making it more convenient and quick to use. Scope of application: Precise positioning and measurement define this drilling ruler, which is suitable for drawing, painting, woodworking and construction. Students, artists and draftsmen like its wide application, while engineers and architects appreciate its accuracy. Color: Black Material: Metal Size:30cm Package Contents: 1set x Scoring Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.