1Aluminum Alloy Material: Made of premium aluminum alloy, our right angle stair gauge is lightweight, robust, and ensures long term stability for reliable measurement support. 2Hex Design for Stability and Accuracy: Featuring a hex flat design, our right angle ruler clamp increases stability and accuracy, making measurements more accurate and convenient for seamless staircase design and quantification work. 3Multi Functional Tool: Not just for stair quantification, our right angle ruler clamp can also be used for other right angle measurements and layout work, providing a versatile and practical solution for different occasions and needs to enhance work efficiency. 4Secure Grip with Black Oxide Steel Screws: Equipped with black oxide steel wing screws, our stair gauge provides a non slip grip, making it easy to hold and twist onto any rafters, even when wearing gloves. 5Versatile Usage: Ideal for staircase beam layout, joist layout, and more, our staircase ruler clamp is easy to set up on any material, especially useful when dealing with spaces in wood. 1 x Framing Square Attachment Jigs