Serviceable Quality Selection: our stair gauge is made of quality aluminum alloy with anodized surface, stable in structure, serviceable and reliable, sturdy and light, hard to break or deform, a practical tool for your accurate layout Accurate Mark and No Slip: speed square holder is featured with a hexagonal plane, more fitting borders than circles, and it is taller, keeping the ruler perpendicular to the material, making your marks more precise;   Moreover, the thumbscrew increases friction and prevents slip, so you don't have to worry about gripping and tightening it while wearing gloves Versatile to Apply: our stair gauges for framing square are functional and multi purpose, ideal supplies for stair stringers layout, rafter layout, marking repetitive angles, guiding saws and so on, making your woodworking and other jobs efficient Clip Design: framing tools are equipped with clips, thus you can clip them to your belt, work bag, wall hook and other places, to prevent them from being lost and falling, and it is convenient for you to get and access them when you need them Note: The data are manual measurement, please allow a 1-3cm error, due to the differences between the light and the display, there will be a certain color difference, the specific received in kind prevail.