A-type shaft joint: 

Joint shaft outer diameter 20MM

Length 30MM (with locking nut); pin hole

Diameter 10MM, distance from the center of the pin hole to the end of the connector

14.5MM away.

When not equipped with connectors, the clamp body has M12 internal teeth.

Tracheal joint inner hole=6MM

B-type hole connector: 

The inner diameter of the connector hole is 20MM deep

30MM; latch hole diameter 10MM; latch hole center

The distance to the connector end face is 14.5MM

When not equipped with connectors, the clamp body has M12 internal teeth.

Tracheal joint inner hole=6MM