This is a 254 piece, zinc plated steel, Metric cotter pin assortment that is comprised of the following twelve sizes: 1X12, 1.6X10, 2X20, 2X36, 2.5X16, 2.5X32, 3.2X25, 3.2X32, 3.2X40, 4X40, 4X75, and 5X45mm. They are made to the German spec DIN 94 and they come in a durable sectional plastic box that measures 8 1/2  x 5 x 1 1/2".