DeWalt's I-Beam levels offer precision leveling accuracy in a robust and durable design. Available in various lengths, the I-Beam features durable block vials, instead of standard vials, that provide leveling accuracies of +/- 0.0005 in. and enhanced damage resistance. Each base is designed with V-Grooves for accurate reading on both flat and rounded surfaces, and each end cap is constructed with over-molding for enhanced impact protection. Includes: 24 in. Premium I-Beam Level - DWHT42151.