The Irwin Tools 1801107 5-foot Extendable Level extends to 13-foot 10-Inches and is constructed of three heavy-duty aluminum I-Beam rails that extend up to almost three times the collapsed length, locking securely in infinite settings to meet any extended leveling needs. The Irwin Extendable level features large, easy to read vials and a large handle for easy gripping and holding with or without gloves The Extendable Level is accurate to 0.058-Degree.