High quality: made of aluminum alloy, increased strength and durability combined with light weight. Two screws included: screws are standard size for water bottle holders and water bottle holder. bottle fits most water bottles. The bottle cage has arms that wrap around the bottle for a secure, firm grip so you don't have to worry about them falling while riding. Lightweight and durable design: can effectively reduce the weight of long-distance travelers, ideal for cyclists and racing cars. Easy installation: use an Allen wrench (not included) to secure the cages into the frame screw holes. Please note that threaded holes are required to install the cages. Delivery Quantity: 1pc Package Contents: Only the above package content, other products are not included. Size: 14.5*8.5*8cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) color: red (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)