Level is ideal for the masonry industry. True Blue vials are accurate to within 0.0005 In. (inch) per inch in all 10 working positions. Aluminum reinforced frame will not warp. Polycarbonate lenses will not fog over. Replaceable vials and lenses. No. E90.24: Length: 24 In., Material: Aluminum, Magnetic: No, Number Of Vials: 3, Pkg Qty: 1, Package Type: Card No. E90.48: Length: 48 In., Material: Aluminum, Magnetic: No, Number Of Vials: 3, Pkg Qty: 1, Package Type: Card