Description:This cup holder features a sturdy metal clamp that ensures durability and a secure installation. The one-piece molded design provides excellent stability, making it the perfect accessory for your electric bicycle. It securely holds your drink, even on rough and uneven terrain. Specifications: Clamp Diameter Range: 22-25mm Compatible Cup Diameter: 63-77mm Material: Durable metal clamp + PC Installation: Drill-free, supports vertical or horizontal mounting Secure and Reliable: Keeps your drink firmly in place, even on rough terrain How to install?