The Manfrotto 133B Black Joining Arm item joins two Super Clamps, spaced 6 inches from each other. The hexagonal ends permit locking the clamps together at different angles.

16mm Hexgon stud for Super Clamp
Top attachment 16mm Hexgon stud for Super Clamp
Used to fix two superclamp

Weight 3.53 oz
Attachment (bottom) 16mm Hexgon stud [Super Clamp AR]
Top Attachment 16mm Hexgon stud [Super Clamp AR]
Color Gray
Superclamp Compatible Yes
Product - Length 6.5 in
Material Aluminum