About this item Includes: One Wheel Marking Gauge + Two Extra Blades Wheel Marking Gauge Is A Indispensable Marking/Cutting Gadget Which Will Help You Lay Out Lines Parallel To A Flat Wood Surface With Max Precision And Indicate Exactly Where Wood Needs To Be Cut. The Laser Engraved Graduation Marks On The Bar Are Available In Both Metric And Imperial Versions Up To 6 Inch/150 mm 1.5 Inch Diameter Solid Brass Face Can Glides Against The Edge Of The Workpiece For Smooth Marking Aligned To Or Against The Wood Grains - Cutter Head Retraces Into Countersink In Head To Protect When Not In Use 2-Stage Adjustments BodyEasy And Precise Adjustments - Quick Turn Of Knurled Adjustment Knob And Tail Help To Make Adjustments Faster And Easier.