I was looking for something similar to save me drawing one up but couldn't find one here.

(There must be one somewhere but I couldn't find it, so apologies to anyone else who already has one here)

This T square is just 4mm deep at the blade and 6mm at the edge piece. The blade is 142mm long.

I use it for cutting paper, foamboard and the like.

No measuring marks on it but can be added if required.

Made with TinkerCad. Sliced with Ultimaker Cura V 5.5.0