Compact carbon steel 90 degree square

with storage case

the block is 9.4mm thick and the arm is 2.6mm thick.

sizes are 

A - 63mm by 40mm

B - 80mm by 50mm

C - 100mm by 63mm

D - 125MM BY 80MM

E - 200MM BY 125MM

for general marking out

there is also the option of the flat stainless 

plate square ( brown photo) 1.2mm thick

etched scale metric both sides