PRO LINE 200 STAIR WIZARD GAUGEThe Stair Wizard creates a complete template of each stair tread and riser then guides you to a perfect cut in one third to one half less time. It works on vinyl, rubber and hardwood treads with stair widths from 31 1 2" to 53", or up to 81" with one set of No. PL200A Extensions. Fast, accurate and easy to use pays for itself on the FIRST job. Adjustable stops automatically correct for tread overhang, or nosing thickness, and the locking angled braces