Material---Made of aluminum alloy, it has torsional strength, durability and corrosion resistance. Super part for quick markings in mm range. The ruler marking is precise, versatile and easy to use. Easy to Use---Marking ruler is precise, versatile, and easy-to-use. Find the hole corresponding to the scale, insert the pen into the hole, and draw the desired line. Each hole represents 1mm, and the distance between the two holes is 5mm.Find the hole corresponding to the scale, insert the pen into the hole and draw the desired line. Ferfect Measuring Tool---Follows the edge of your work piece to mark perfectly placed horizontal or vertical lines, micro-fine marking holes and slots place your mark exactly on target, makes the woodworking ruler a perfect tool for you., Weight: 0.20062065842 pounds, Manufacturer: Namvo