Made of silver anodised aluminium profile, box section 50 x 22 mm; ends are closed with plastic plugs.
For stepless measuring and transferring of angles in the area from 0° to 270°. Mobility of measuring shanks is adjustable.
Robust plastic head with scale is produced of quality materials. Angles can be fixed in 15° steps.
Two plexiglass vials are built in and therefore the square can be used as spirit level as well.

Shank dimensions: longer 80 cm, shorter 60 cm.