Features:   The Thin,Satin-Finish Stainless-Steel Blade Is Easy To Read And Minimizes Parallax Error.   There Is A Notch Every Sixteenth-Inch All Along The Blade.   The Graduations Are Held To A Tolerance Of .004" Total Accumulated Error Over The Length Of The Blade.   The Series Of Precisely Machined Indexing Holes And The Spring-Loaded.   Just Press The Head To The Desired Angle,And Then Press The Straight Line.   The Head Can Be Adjusted Between 0 And 70, And Is Firmly Locked Every 5 (Plus 22-1 / 2 And 67-1 / 2),So As To Provide You With An Accurate Reference Angle And Length Respectively.   Just Drop Your Pencil In The Notch And Slide The Head Along The Edge Of Your Stock For A Perfectly Parallel Line.  Specifications:   Material:Metal   Color:Silver   Size:10Inch,15Inch,20Inch  Package Include:   1PCS X Woodworking Edge Ruler