Feature: 1. There is a scale mark on the back of the product, which can be used to measure the height. 2. The tip of the product is half the height of the workpiece, which can be used as a marking gauge, and the product can be moved horizontally to mark the workpiece. 3. Hollow Design: This height gauge features a hollow design, the hollow back reduces weight and increases grip. 4. Excellent Aluminum Alloy Material: This height gauge is made of excellent aluminum alloy material, which is sturdy and wear , not easy to be damaged, and has a long applicable life. 5. Wide Application: This height gauge has a wide range of applications and can be used for woodworking height measuring tools, and Line drawing rule. Specifications: Product name: Half-line drawing gauge Product stroke: 0-58mm Color: Black Material: aluminum alloy The actual object may have color difference due to different light or display Package Contents: 1 x Adjustable Table Saw 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.