Double end key assortment of 36 pieces. Make your own double end nickel keys. Assortment includes 3 each of the small end sizes: 1.60mm, 1.65mm, 1.70mm, 1.75mm, 1.85mm, and 1.95mm. Also included are 3 each of the large end sizes: 3.0mm, 3.25mm, 3.50mm, 3.75mm, 4.0mm, and 4.25mm. A total of 18 small ends and 18 large ends! Assortment is supplied in a plastic box with containers for the small ends. Swiss sizes.