Extra-stiff aluminium profile with reinforcing ribs for high stability and handle openings for optimum handling and a secure grip when working. Two vertical spirit levels for quick reading in any position. Stabila quality vials for optimum readability - highly transparent, resistant acrylic glass with precisely ground inner contours and fluorescent vial liquid. Stabila installation technology ensures long-term precision - measuring accuracy in normal and envelope position ± 0.5 mm/m, high-precision measuring in all positions. End caps with slip stopper ensure a firm fit of the spirit level when marking out. Shock-absorbing end caps made from a two-component material mix protect the profile during impacts. Removable end caps allow for precise positioning and marking right into corners. Easy to clean thanks to the electrostatic powder coating. Features include 1 horizontal bubble, 2 vertical bubbles, 2 coated measuring surfaces, and 2 reach-through openings.