High-precision Scale Ruler T-type Hole Ruler Stainless Woodworking Scribing Mark Line Gauge Carpenter Measuring Tool Features: 1. The ultra-precise marking ruler has tiny holes and slits at each scale, enabling you to make a point or mark a line with a pencil, accurate to the width of a hair! Graduation is indented and etched in black for easy reading. The surface is non-reflective, allowing tired eyes to mark the exact start even in low light. Select the appropriate slot or hole, insert a 0.5mm mechanical pencil and mark the measurements with absolute accuracy. 2. A square is just what you need to lay out and measure along the edge of a board or other workpiece. The micro-marked holes at each graduation mark allow you to instantly position a sharpened pencil tip or accurately line a target with zero uncertainty and no eye strain! 3. All rules are only 0.25 mm thick and therefore cannot be used for roughing! With proper care with this tool, you will not only be happy with the finished job, but also with the drawing. 4. When you look at it from the side, it is difficult to draw an accurate line with a traditional ruler, which usually means inaccuracy. The 5.90 shape holds it tightly in place, while the two graduated surfaces allow you to mark and measure on tops, edges and corners at the same time! There are even two vertical end scales for drawing precise parallel lines relative to the working edge. Specification: Name: Hole marking ruler Size: 180/200/300/400mm Material: Stainless steel Package: 1*Hole marking ruler