1、ACCURATE AND NON SLIP: The 6in, 8in, 12in metal ruler feature a wide sliding square design for accurate measurements for a wide range of drawing tasks for mechanics, woodworkers, mathematics and engineers. The adjustable slider is tightly locked for easy surface measurement. Two wing screws ensure safe sliding and do not loosen during use 2、THICK MATERIAL: Straight edge metal wheel ruler is made of top grade aluminum alloy, measuring ruler inflexible, 1in wide, 5/32in thick, and has a beautiful red matte finish, lettering is excellent, suitable for marking, scribing 3、VERTICAL SCALE AND NOTCH: You can measure the height of the table milling head or table saw blade using the vertical scale 1/4‑3/4 in at the end of the pocket ruler, with a small notch at the end for the pencil to hold in place to form an alignment line and fit the mark as drag the ruler 4、IMPROVED MEASUREMENT ACCURACY: The end notch design of the woodworking pocket ruler tool hold the pencil tip in place stably and facilitate excellent control of parallel lines. Effectively prevent slippage and obtain more accurate data 5、WOODWORKING TOOLS: T type pocket ruler possess moderate size, easy to carry, accurate ruler can be used as a good measuring tool for engineers, can be used in workshops, home improvement, toolbox, cabinets