Excellent locking function: Loofu with locking keeps its shape after measurement, accurately measures and reproduces the contour, you can quickly move the contour to anywhere, saving you a lot of time and energy. Aluminum Lock Cylinder: The Loofu Contour Gauge is equipped with a metal lock cylinder, which is stronger and more durable than plastic ones, suitable for long-term use and can stay in place. EASY TO USE: Available on both sides, the wider design can handle more measurement situations. Both centimeters and inches are printed on the surface of the ruler, and the white text is easy to measure and read. High-quality material: The contour ruler is made of high-quality ABS plastic and aluminum lock cylinder, which is strong, rust-proof and durable. PREMIUM QUALITY: Great gift for male fathers and husbands, gift guide for carpenter builder DIY lovers. If you encounter any problems during use, you can contact our customer service as soon as possible.