• Rugged extruded aluminum frame, black annodized 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 • ess and replacement • Level vial features large top-read window. • 3 Vials: 1 Level/2 Plumb • Lgth In=36