It's a high-quality aluminium screw-in adapter.
Technical data:
Thread 1: M22x1, 5
Thread 2: Dash 16
Material: Anodized aluminium
| Manufacturer: | Arlows | 
| Category: | METRIC THREAD | 
| Item number: | AR8742 | 
| Angle: | Straight | 
| Thread: | Dash 12 | 
| Product weight: | 0,10 Kg |