48", Heavy Duty, Aluminum I-Beam Level, Oversized 1/2" Diameter Vials Are Easy Read, 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 Frame When Dropped.