High Quality: The high ladder ruler is made of high quality aluminum alloy, the surface is anodized, stable and durable. Perfect Design: Hexagonal flat design fits edges round, body makes the ruler perfectly perpendicular to the material, workpiece fixation is stable and accurate, stair gauge comes with black oxidized steel thumbscrews, non- and durable, even grab and screw to any rafters, and the anti-lost bracket makes it easy to carry while wearing gloves. Versatile: square attachments, stair gauge knobs for circular saws, stair stringer layouts, carpentry squares to repeat angles, carpentry squares to guide saws for angled cuts. Professional: Tall Stair Gauge It's a must-have for stair builders, you 't need to readjust the square time to the step. Make each stair is , giving you an accurate framing fixture layout time. NOTE: Currently not suitable for smaller plates from Ruobi and , as they have a lip of the plate. Works with most framing squares, rafters or carpentry squares less than 0.315inch (8mm) thick. color:Blue Material:Aluminum alloy Package Contents: 1 x stair gauge Fixture Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed is +/- 1-3cm.