Package Inclulded: 1 x right angle ruler/marking ruler Right Angle Ruler: Unique Design: The ruler is specially designed for the positioning and it is suitable for marking of woodworking mortise and mortise, and the size of it is about 180mm/7.09in(about). Premium Material: The ruler is made of stainless steel, featured by the clear and accurate scale, and it is CNC processed, featured by the comfortable texture, and the vertical knurled nut is made of pure copper. Fine Craft: The 1mm/0.04in, 0.5mm/0.02in, 0.25mm/0.01in(about) scales feature the fine-marked holes and grooves, making the measurement result more accurate. Easy to Use: The ruler is accurate, versatile and easy to use, which will meet your needs. Multiple in Use: The ruler can be used to make horizontal lines, vertical lines, long lines, short lines, parallel lines, and right angles can be operated as you wish, meeting all the requirements of woodworking marking. Marking Ruler: Accurate Operation: 1mm, 0.5mm, 0.25mm each scale position has fine-marked holes and grooves, making the operation more accurate. Premium Material: Made of stainless steel, the scale is clear and accurate; Featuring CNC processed, the ruler is comfortable; the vertical knurled nut is made of pure copper. Innovative Design: Independent and innovative design; the ruler is designed for the positioning and marking of woodworking mortise, and it is comfortable and precise. There are 200/300 / 400mm sizes for customers to choose. Easy to Use: The ruler is accurate, universal and easy to use. Wide Application: Horizontal lines, vertical lines, long lines, short lines, parallel lines, and right angles can be operated as desired, meeting all the requirements of woodworking marking. Specifications: Material: stainless steel Color: silver Size(about): 180mm/200mm/300mm/400mm (7.09in/7.87in/11.81in/15.75in) Hole diameter(about): 0.5mm/0.02in Suitable for filling(about): 0.5mm/0.02in Distance between each hole and slot(about): 1mm/0.04in, 0.5mm/0.02in, 0.25mm/0.01in Accuracy: 0.25mm Usage: Method 1: insert the pencil into the corresponding hole and gently move the scriber (the nut on the chute can be used as a handle to facilitate the scribing) to obtain an accurate straight line :; Use method 2: the aluminum alloy chute of the product can be placed in the type 30 chute for marking on the professional woodworking table.