ProKnee's Treadman® multi angle stair tread cutting system is a tool that cuts installation time in half while side stepping pattern scribing or using tricky technical techniques. By securely locking in each step’s and tread’s specific size, Treadman acts as your template and cutting guide for quick, accurate and perfectly cut stair treads every time, thus eliminating the chance for costly mistakes. The Standard Treadman® tool can do stair treads from 35 ¼” to 61 ½” in length. If you have stairs that are shorter or longer, ProKnee® offers 3 Extension Kits that can be purchased separately - allowing you to complete installations on treads from 22 ½” to 9’ ½”! Wall plates adjust to step depths from 10” to 13 ¼”, while the 1 Piece Step/Riser Template Kit captures riser heights from 6” to 8”