1. quality material: The stair telescopic multifunctional folding ruler is crafted from stainless steel and aluminum alloy, ensuring durability, rust resistance, corrosion resistance, and a long service life. The surface is anodized to prevent discoloration in humid or temperature environments. 2. Adjustable design: With the stair stencil tool, angles, length, and height can be easily adjusted to meet all work requirements. By connecting different poles, it can be extended or retracted from 11 to 60 inches, catering to various project needs. 3. Easy to use: The length of the stair gauge can be quickly adjusted using four knobs and securely locked in place. Simply insert the tool between two walls, tighten it, and fasten the screws to measure length and side angles. Then, use it to measure stairs or risers with ease. 4. precision: The stainless steel plates on both sides of the stair measuring tool feature clear, accurate scale markings, enabling precise adjustments for stair installation. Easily set the correct length, angle, and step size for accurate measurements every time.