Stanley 42 480 I Beam Level & Plumb, I Beam, 2, Plain, Top Read Window, 48 in Overall Lg, Acrylic G4409937 SPECIFICATIONS SPECIFICATIONS Water Resistant Type Surface Break Glass Window No Features Automotive Grade Rubber Door Seal Which Prevents Water and Dust Ingress Shock Absorbing End Caps Hold Up to Heavy Use Magnetic Nonmagnetic Nonmagnetic Top Read Top Read Window Number of 45 Degree Vials 0 Number of Level Vials 1 Number of Plumb Vials 2 Frame Material Aluminum Vial Type Bubble Item I Beam Level Number of V Grooves 0 Number of Magnets 0 Vial Material Acrylic Number of 30 Degree Vials 0 Total Number of Vials 3 Lighted Vials No Number of 45 Vials 0 Number of 30 Vials 0 Accuracy Standard 0 Vial Illumination None