Specification Name: Stair tread template tool Measuring range: 8-56 inches Material: aluminum alloy DESCRIPTION ACCURATE SCALE: Stair tread templates make it easy for tread installers to operate and adjust to the correct length and angle, easily and accurately get the desired result of the treads, no tape measure needed, saves most of the working time. PREMIUM QUALITY MATERIAL: Our stair tread template tool is made of high quality aluminum alloy material, sturdy and impact resistant. Anodized for hardness, durability and reusability. EASY TO USE: The length is easily adjustable with 4 knobs and locks firmly into place. Insert the tool between two walls, firmly stretch and tighten the screws to measure the length and side angle, then you can use it to measure stairs or risers. It is easy to operate and can be used to mark cut lines, perfect for a variety of DIY projects. EASY TO INSTALL: This stair measuring tool is easy to install and remove, just fix the screws and knobs in the corresponding screw holes. The looseness of the adjustment knob is the length and angle at which the switch extends for easy operation. WIDELY USED: Our measuring tool can be used in many woodworking scenarios to help you create the right size and angle cuts on stairs, risers, shelves and drywall. Product List 2×Tread Template 2×16inch Slider 2x12inch Slider 2x8inch Slider 2×Wooden Strip Fixing Blocks 9×Knob 18×Long Screws 9xShort Screws 1xWasher (Color is Not Fixed) 1xHex Screw Wrench