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, taller body makes the ruler perfectly perpendicular to the material, workpiece fixation is very stable and accurate, stair gauge comes with black oxidized steel thumbscrews, non-slip and durable, even Easily grab and screw to any rafters, and the anti-lost bracket makes it easy to carry while wearing gloves. Versatile: Frame square attachments, stair gauge knobs for circular saws, stair stringer layouts, carpentry squares to mark repeat angles, carpentry squares to guide saws for angled cuts. : Tall Stair Gauge It's a must-have for stair builders, you don't need to readjust the frame square every time to mark the step. Make each stair is very , giving you an accurate framing fixture layout every time. NOTE: Currently not suitable for smaller plates from Ruobi and , as they have a lip on the edge 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 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.