Adequate Protractor For Fixing To The Track
....Protractor for blackboard, 4.5mm rigid plastic, 180 x 1 degree, base 440mm, with detachable handle.
....Plastic , yellow.
Working handle is in the middle of the protractor.
Effective measuring angle: 0-180.
Effective working size: 500mm.
Size: 500*282*10?±0.2?mm.