This is a good quality stainless steel ruler. Measure with absolute precision using this 600mm Stainless Steel Ruler with increments as fine as 0.5mm and 1/64 inch. If you are ready to step up to the next level of accuracy, this is the ruler to get. The ruler also has a rounded top edge, is 28mm wide x 1.5mm thick. There is a 8mm diameter hole on top for the purpose of hanging it up in your workshop.