Extremely resilient, torsion-resistant aluminum R-profile, extra-wide measuring surface for extreme stability, no tipping over during the measuring process, three secure marking edges for exact marking over the full length of the profile, continuous handrail with finger grooves offers extreme grip when measuring and transporting, coated measuring surfaces protect sensitive parts Surfaces, continuous bridge over horizontal dragonfly additionally stabilizes the profile, end caps with slip stopper ? Firm seat of the spirit level when marking, shock-absorbing end caps, the two-component material mix protects the profile from impacts, removable end caps, exact positioning and marking right into corners, the R-profile shape allows building material to be removed easily, easy to clean, STABILA installation technology ensures Long-term precision, measuring accuracy in normal and reverse position ± 0.5 mmm, particularly suitable for craftsmen who have to subject the tool to high stress, for example in bricklaying and carpentry work, in timber construction, reinforced concrete construction, window construction, road construction, gardening and landscaping