€¢ Professional H-D aluminum I-beam frame level €¢ Precision milled frame for accurate work surface €¢ Adjustable cat's eye yellow double bent vials for accuracy with replaceable protective plastic lenses and vials €¢ Contractor red level with machined edge €¢ Shock absorbing end caps on 24 in; 36 in & 48 in sizes €¢ 6 vials >> The Sands Level 48 in HD extension aluminum. Precision milled frame for accurate work surface. Adjustable Cat's Eye Yellow double bent vials for accuracy with replaceable protective plastic lenses and vials."