Was quite hard to find in metric but now I've found it! I don't do roofing, I just wanted this special Speed Square (from Swanson) to use with a circular saw (as a ruler to cut wood) and draw cutting lines on various materials (wood, aluminum, iron.). I wanted Swanson because it's a very respectable name and moreover because it's made in the USA and while I'm not American I'm doing my best to support the American economy. I made no mistake buying it, it is of very good quality and exactly 90 degrees. I'm very happy with this purchase, thanks in part to Revain for finding it in Metric. And by the way, yes I would recommend it as a quality instrument.