Accurate Operation: 1mm, 0.5mm, 0.25mm each scale position has fine-marked holes and grooves, making the operation more accurate. Made of stainless steel, the scale is clear and accurate, CNC machining, comfortable texture,Make marking a lot less time consuming and far more accurate. The 90 shape holds it snugly in place while the two-scale surfaces let you mark and measure on the top, edge, and corners simultaneously! There are even two vertical end scales for drawing precision parallel lines relative to the edge of your work. This multifunctional ruler can scribe horizontal line, vertical line, long line, short line, parallel line and right angled line, satisfying your various marking needs. The Right Angle Ruler is precisely what you need for layout and measurement along the edge of a board or other workpiece. Micro-fine marking holes at every scale line allow you to instantly locate your sharp pencil point or scribe exactly on target with zero uncertainty and no eye strain!