All advantages like 211 Base but:
With detachable M10 Europin (V4A / S316)
With detachable special M10/M9 bolt (V4A / S316)
With R3 joint (M10/M10)
With special M9/M6 double sliding block (V4A /S316)
Without gluing, completely dismountable
Easy replacement of the rubber joint
With a significantly stronger M9 bolt 

Furnishing
R3- Joint M10/M10 rubber joint
M10 Europin
M9/M6 double sliding block with locking screw