This 600mm rule fits the Axminster Professional 150mm and 300mm combination square sets. It is a great tool, allowing you to scribe or strike a line across larger workpieces. Having the options of using your original 150mm or 300mm rule and a 600mm rule extends the scope of the combination set. Made for the combination square, it is thicker than a normal rule making a useful general straight edge. Available as metric only, with whole millimetres showing at the top and half millimetres at the bottom; on the reverse the half millimetres are at the top. The scale is clear and easy to read with an anti-glare pearl finish.