Completely embedded inside the 28mm third-generation lean tube for a clean, flush appearance with no protruding parts.

Supports angle adjustment from 0° to 180°, enabling special connections such as flip mechanisms.No additional pipe cutting is required, allowing easy construction of non-right-angle frames.

Built-in rubber expansion block enables tight, secure locking with the lean tube simply by tightening the screw.

The main body is made of die-cast aluminum alloy, offering excellent impact resistance and corrosion resistance, and resisting deformation or breakage even after long-term use.