This stair measuring jig is a versatile woodworking tool designed for both weekend DIY enthusiasts and seasoned professionals. It supports a wide array of projects, from installing hardwood floors and cutting stair treads to measuring window sills and closet spaces. The upgraded locking system uses dual screw nuts to secure the ruler and template, removing the need for rubber washers to ensure steady, reliable performance during work. Crafted from 4 mm thick aerospace-grade aluminum alloy with CNC anodized finishing, it offers durable, heavy-duty construction for tough jobs. Precision plated markings enable accurate measurements for stair treads, risers and shelves. Its modular design features 3 adjustable extensions that can be combined in multiple ways, delivering a measurement range from 16.6 to 61.1 in. It also comes with a compact Oxford cloth storage bag to keep all components organized and easy to access. Color: Red Gray.