Stanley 42 480 I Beam Level & Plumb, I Beam, 2, Plain, Top Read Window, 48 in Overall Lg, Acrylic G4409937 Brushless Motor: Yes Brushless Motor: Yes They are a cost effective alternative to steel in areas where local safety codes don't require steel housings and where fixtures won't be subject to impacts or abuse 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 Plumb Vials