Multi-functional twin adjusting ring for the connection of square tubes 20 mm, 25 mm and 30 mm, adapter for the combination stand system 300 series (square 30 mm).

Round tubes Ø 20 mm can be clamped into the square 20 mm insert hole as well.

1st surface: insert holes square 20/square 20 mm
2nd surface: insert holes square 25/square 30 mm
For connection of:
- 1 square tube 20 mm und 1 square tube 25 mm (90° offset)
- 1 square tube 20 mm und 1 square tube 30 mm (90° offset)
- 1 square tube 30 mm und 1 square tube 25 mm (parallel)
- 2 square tubes 20 mm (parallel)
- 2 main tubes Ø 20 (parallel)