Accurate and timesaving design The stair tread template lets installers quickly and accurately set the correct tread length and angle without a tape measure, saving substantial installation time. Flexible and adjustable This stair gauge measures 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 tool length is adjustable with four knobs and locks firmly in place. Insert the stair wizard between two walls, stretch and tighten the screws safely to measure the length and side angles, then use it to track steps or risers. Durable materials Stair tool construction uses stainless steel and aluminum alloy, with an anodized surface to prevent discoloration in humid or temperature environments. Use scenarios stair installation: accurately determine tread length and angle to fit existing stair geometry. Stair riser replacement or renovation: precisely measure risers for consistent step height and alignment. Shelving and storage projects: measure and set distances for sturdy, level shelves in closets, garages, or workspaces.