GreatNeck 10112 24 Inch Economy Level With 3 VialsMayes 24" Aluminum I-Beam Level. 1.5mm anodized aluminum frame. Protective end caps to prevent marring of surfaces. Magnetic V-groove base for work on pipe or conduit. Three high impact vials with top view center vial. Accurate to within .001GreatNeck 10112 24 Inch Economy Level With 3 Vials Features:; Lightweight aluminum frame; Large, easy to read vials; 3 vials per level; 24" length