BR Tools OR419M 34 Metric Size O-Ring Assortment Set 419 Pieces O-ring assortment has 70 duro shore professional quality for many jobs Contains 34 different metric sizes Features 419 O-Rings with 1.5, 2, 2.5 and 3.5mm thicknesses Inside diameters range from 3 to 50 millimeters Comes with portable red storage case