Johnson 3700 Professional 24" Heavy Duty Top Reading Aluminum I-Beam Level

Rugged extruded aluminum frame, black anodized for long life and shock-protecting plastic end-caps. Vials fit into precision-stamped cutouts and are held in place by "Quick-Change" ABS plastic vial covers with screwed-in clear acrylic lenses for easy access and replacement. Level vial features large top-read window.