Easy, I made mine 30 years ago, the 5 is 5 feet. I still have it hung on the wall, comes in occasionally.Three straight battens, screwed together so sides are 3-4-5 ratio. Perfect right angle. Why is it so difficult?
Not a problem.with this, am am really sorry for any confusion, any hostility.
This is likely a much much lower quality, but I found a 600mm combination square (but did not see any 900mm):The largest I know is 400mm and Bahco sell one.
What's the accuracy like?This is likely a much much lower quality, but I found a 600mm combination square (but did not see any 900mm):
And would suggest this 600mm combination square as being better as from Axminster.
Axminster Professional 600mm Metric Rule For Combination Square
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...www.axminstertools.com
You might need to modify your thinking.That is what I am after, just 900mm really…