What size wrench. Large locknut on adjuster bar for boxblade

[couleedude]

I found the nut size on the exploded diagram, but it said 30mm and that wrench was too small. With a tape measure, it appears to be close to 1-1/2". I am purchasing a single wrench for this, not part of a set, and want to get the correct size this time.

Any idea what size that is?

 

[DONLI]

30mm

 

[jimh406]

1 1/2 is 38mm according to google.

 

[old and tired]

Buy a BIG adjustable wrench...

 

[OntheRidge]

Plus one on the adjustable! Multi purpose.