There is simply no quicker or easier way to scribe treads and risers than with our Stair Jig. Adjusts easily without tools from 32″ to 52″ for a perfect fit every time. For lengths 52″ to 72″, just add an Extender. Keep adding 20″ Extenders to span any length tread. All joints lock tightly for dead-solid accuracy. The T-bar angle adjusts to greater than 45 degrees. And you’ll appreciate its lightweight, all-metal construction.