48" Contractor Machined Top Reading Aluminum Level, 3 Vial, Extruded Aluminum I-Beam With Black Anodized Finish, Precision Machined Leveling Edges, Large, Magnified Top Read Window, 360 Degree Acrylic Yellow Barrel Vials, Screw On, High Impact Resistant Plastic Covers With Protective Lenses, Shock Protecting End Caps, Frame Dimensions: 1" x 2-1/4".