Angle standard 90° made of hard stone grade 00 triangular shape

Execution:
- made of black hard stone with a very fine and homogeneous structure
- two narrow leg surfaces lapped at right angles to each other (DIN 876/00)
- Surfaces polished
- Squareness according to DIN 875
- better handling with through holes

Use:
For controlling the 90° angle in the vertical plane in the control room.

Delivery:
With test report.