Stainless Steel Ruler Body- The Ruler Is Made Of Stainless Steel With Precision Workmanship, Clear Scale, Cnc Machining And Comfortable Texture. The Vertical Adjustment Knob Uses Pure Copper Knurled Nuts For Easy Operation . There Are 200/300/400Mm Sizes For Customers To Choose From.There Are Even Two End Vertical Scales To Draw Precision Parallel Lines To The Edge Of Your Work.Minimum Accuracy Of 0, 25Mm- 0.25Mm Minimum Precision Makes The Operation More Accurate And Reduces The Error. The Ultra-Precise Marking Ruler Has Tiny Holes And Slots At Each Graduation, Allowing You To Make A Dot With A Pencil Or To Mark A Line Accurately Within The Width Of A Hair! The Scale, Being Recessed And Etched In Black, Is Easy To Read.Clear Engraving- Clear And Precise Laser Engraving Scales. The Imported 0.5Mm Pencil Makes The Line Smoother, The Surface Is Non-Reflective And Allows Even Tired Eyes In Weak Light To Mark The Exact Start. Select The Appropriate Slot Or Hole, Insert A 0.5Mm Mechanical Pencil And Mark The Measurement With Absolute Precision.Multiple Functions- Achieve Multiple Functions Including Horizontal Line, Vertical Line, A Long Line, A Short Line, A Parallel Line And A Right Angle Line, Meeting Your Various Marking Needs. And Measure Top, Edge And Corners Simultaneously!Suitable For- Suitable For Positioning And Marking Woodworking Mortise And Tenon Work. The Right Angle Ruler Is Exactly What You Need For Layout And Measuring Along The Edge Of A Board Or Other Piece. Micro-Fine Marking Holes At Each Scale Line Allow You To Instantly Locate Your Sharp Pencil Tip Or Trace Exactly On Target Without Any Guesswork Or Eye Strain!