This storage system is excellent for storing vials of isotopes, contaminated instruments and tools, radioactive samples, solutions, or waste.0.76 mm (0.030") thick lead shield encased in 6.4 mm (0.25") thick high-density polyethylene helps contain radiation without lead exposureEach box has a cover of the same lead/polyethylene construction with a 32 mm (1.25") external overlap designed to prevent radiation escapeNote: The handle opening is 89 x 29 mm (3.5 x 1.13").