HEAT-TREATED ALUMINIUM ALLOY: High quality material and manufacturing process for extra strength and durability combined with low weight, 2.1 oz (61g) each
ANODIC OXIDATION: maintains black surface more durable and NO SCRATCHES to your water bottles.
4 X M5 x 12 SCREWS INCLUDED,: The screws are standard size for most of bikes with DRILLED HOLES.
If it's not workable for your bike, please use your old screws or purchase separately from your local store.