ENKU magnetic number boxes help organize your work in your workshop. Many other industrial and commercial operations find them increasingly helpful in simplifying product identification and production sequences. The smooth polypropylene box will not mar laquered surfaces, is not affected by extreme temperatures, and is resistant to abrasion and chemicals. The enclosed double magnetic field magnet assures surface adhesion even at speeds up to 100 km/h. Lids in the same color as the number boxes are optional. Without the lids you may stack the numbers and store them on your workbench.