Including 6, 8 and 12 inch Aluminum Precision Rulers. Professional woodworking rulers. Three sizes meet your woodworking measurement Made of Aluminum Alloy and made by CNC process. wear-resistant, rust-proof, light and portable. Will not be worn after tens of thousands of of use. in slide stops which can go through the entire length of the ruler. Helping repeat the measurement on the multiple boards When you need vertical measurement, slide the stop off and insert it into the cut-out blade and then your rule has a perfect stand to keep it upright. With Inch and Metric Indicators on both sides, this steel ruler has clear and accurate scale, easy to read. Material: Alloy colour: blue Package Contents: 3 x positioning 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.