Extremely resilient, torsion-resistant aluminium R-profile. Extra-wide measuring surface for extreme stability, preventing tipping over during the measuring process. Three guide-safe marking edges allow for exact marking over the full profile length. The continuous handrail with finger groove provides excellent grip during measuring and transport. Coated measuring surfaces protect sensitive surfaces. A continuous web over the horizontal vial additionally stabilizes the profile. End caps with slip stoppers ensure a secure fit of the spirit level when marking. Shock-absorbing end caps made from a two-component material mix protect the profile from impacts. Removable end caps allow for precise positioning and marking right into corners. The R-profile shape facilitates easy removal of building material. It is easy to clean. Stabila installation technology ensures long-term precision, with measuring accuracy in normal and envelope position of ± 0.5 mm/m. Equipment includes 1 horizontal bubble, 2 vertical bubbles, and 2 coated measuring surfaces.