• High-quality aluminum alloy material, lightweight, durable, and anti-corrosion, offers greater compression resistance. • Hollow design that facilitates seat height adjustment and quick installation on the bike, with replaceable bolt. • Compatible with seat posts of 27.2-28.6 mm, ideal for all types of bicycles. • Design with rotating lock and extra-long ergonomic lever for greater clamping force and safety while riding. • Quick-release clamp suitable for road, mountain, folding bikes, etc.