24", Heavy Duty, Aluminum I-Beam Level, Oversized 1/2" Diameter Vials Are Easy Read, Heavy Duty Aluminum Frame Is Job Site Tough, Ergonomic Cushioned Hand Grips, Surround View Vials Reflect Ambient Light For Easy Read, Top Read Window Maximizes Readability, Field Replaceable Cover Plates & Vials, Shock Absorbing End Caps Protect The Frame When Dropped.