Fixing by slip-in pivots. this spirit level has adjustable slip-in pivots which fit flange bolt holes of various diameters. The adjustable water-level is surrounded by a scale. The scale has both: Degree and inclination-percentage markings. Any angle of degree or inclination can easily be set and read without the need for additional calculation. In this way flanges can be aligned with great accuracy. Material: Anodized aluminium.