These small try squares with steel blades and brass stocks fit into any pocket. There's a hole in the steel blade for hanging on a peg. Manufactured by SHINWA.
Blade dimensions 13 x 1.5 mm
Stock dimensions 15 x 6 mm
Sizes available;
Overall dimensions 45 x 39 mm
Overall dimensions 60 x 44 mm
Overall dimensions 75 x 52 mm
Overall dimensions 90 x 60 mm