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!