Level Plumb Square Length 50cm size 52x12xh6. Will Angles stops at 0°45°-90°-135°-180° all on one level. The design allows the level to be folded in half for convenient storing. 45° position for laying out diagonal floors. 90° position for setting square on floors or to check the plumb. 180° position to check the level and to take measurements. A very handy all purpose square.