Aluminum Alloy Material -- Made of aluminum alloy material, durable, easy to use, set height and depth of your router with great accuracy and precision Accurate Depth Adjustments -- The height gauge is clear and easy to read, You will get easy and accurate depth adjustments The measuring height is convenient and precise, handy for woodworking marked. Require Height Measurement -- Suitable for table saws, band saws, flip-chip engravers, milling machines and other machines that require height measurement Easily Aligned With The Work Table -- It can be easily aligned with the work table surface and the desired scale is aimed at the target so that it can be adjusted to approximate height until it is fit and the desired height is obtained