PRODUCT DETAILS Click an item to expand and learn more Overview Stair Tread Gauge and Shelf Scribe Layout ToolEasily transfer stair tread & riser dimensions for a consistently perfect fit.Precision CNC machined from 6061 aircraft grade aluminum & stainless steel.Low profile design with 12" arms allow for measurements in any situation.Massive 51.5" maximum extension width to accommodate any stair.Removable stainless TAN pins mark material edge for easy transfer.3 Year Warranty + Congratulatory Certificate if Broken Reviews Questions and Answers