Incra brings the simplicity of metric measurements to their revolutionary Bend Rules. This 300mm concept rule makes around the corner and edge marking absolutely foolproof! Marks 2 sides at one time precisely in line. It has precision-engineered marking holes and slots at every graduation to guide your mark making it nearly impossible to slip off. Repeat measurements will always be exact with no more eye strain! The stainless steel blade is graduated in 1mm increments. A .5mm mechanical pencil is recommended for the most accurate marking. USA