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Made of high-quality aluminium alloy with exquisite workmanship, which is smooth, lightweight, durable and wear-resistant. Simple and comfortable design, easy and quick installation, the inner diameter of the clamp is 34.9 mm, suitable for 30.4 / 30.8 / 31.6 mm bicycle seat post. Two strong and elegant mounting screws ensure double stability and strength. Suitable for most types of bicycles with aluminium frame, such as mountain bikes, road bikes, etc.