It's a high-quality aluminium screw-in adapter.
Technical data:
Thread 1-1/4 "
Thread 2: Dash 4 (7/16 - 20 UNF)
Material: Anodized aluminium
| Manufacturer: | Arlows | 
| Category: | INCH THREADS | 
| Item number: | AR1550 | 
| Angle: | Straight | 
| Thread: | Dash 4 | 
| Product weight: | 0,10 Kg |