Accurate and time saving The stair tread template lets installers quickly set the correct length and angle with accuracy without using a tape measure, saving significant installation time. Flexible and adjustable This stair gauge helps measure stair treads, risers and shelves. Easily adjust the angle, length and height to meet any work requirement. Suitable for stairs, risers and shelves. Easy to use The length is easily adjusted with four knobs and locked firmly in place. Insert the stair wizard between two walls, stretch and tighten the screws safely to measure the length and side angles, and then use it to track steps or risers. Material and durability Stair tools are made of stainless steel and aluminum alloy. The surface is anodized to prevent discoloration in humid or temperature environments. Use scenarios stair installation Set tread length and angle quickly to align with stringers and ensure accurate steps or risers during construction. Stair remodeling or shelf installation Measure risers and shelves precisely to achieve consistent dimensions and clean lines in remodels or cabinetry work. Field measurement in tight or irregular spaces When walls are close or uneven, insert the stair wizard between two walls to measure length and side angles accurately and safely.