set2: 1 x universal bracket + 1 x hexagonal wrench & 1 x Step Down Adapter Ring
Product Name : Step Down Adapter Ring;Lens Side : 52mm/ 2 inch
Filter Side : 37mm/ 1.46 inch;Total Size : 55 x 6.5mm/ 2.2 inch x 0.26 inch (D x T)
Material : Metal
Color : Black

The 52mm-37mm ring adapter easily screws onto the front of any 52mm lens, and converts the thread size of your lens to the thread size of any other 37mm accessory (such as filters, hoods, flashes and lens converters).
Features:
Universal Ball Head Mount: Equipped with 1/4 inch screws at both ends, compatible with most devices with 1/4 inch screw hole, such as video monitor, LED light and so on.
Flexible Ball Head Mount: Dual small ball head can be adjusted flexibly; and the locking knob ensures secure and quick operation.
Multi-Functional Ball Head Mount: Can be used to mount monitor, LED light or other devices onto camera cage and other photography bracket.
Durable Ball Head Mount: made of aluminum alloy material, durable and sturdy.
Mini Ball Head Mount: mini size design, convenient to carry.

Package Contents:
1 x universal bracket
1 x hexagonal wrench
1 x Step Down Adapter Ring