Minoura AB-100-5.5 Anodized Water Bottle Cage, Blue, 5.5mm Made of #2017 Super Duralumin #2017 is much stronger than standard aluminum that enables smaller diameter to reduce weight AB100-5.5 is made of 5.5mm diameter material and good for MTB riders or touring Comes with lightweight alloy mounting M5x12 screws Made in Japan