Torsion resistant I-profile rail made of cold rolled steel that is heat treated and case hardened. It features removable protective caps with smooth, well-adhering surfaces to protect against damage and scratches. The smooth-running clamping handle provides high clamping force. The robust and reliable design ensures effortless and safe working. It includes a controlled release of the grip pliers through the Trulock pulling mechanism, allowing for a simple changeover from clamping to spreading without tools.