What's in the box:

1/4" Female to 3/8" Female Double Female Screw Convert Adapter for Photography Accessory (Standard)

Features:
Dual threaded adapters.
Aluminum alloy 1/4" female thread and 3/8" female thread.
Converts the 1/4" to 3/8" screw adapter for common tripod.
Suitable for variety of tripods, ball heads, light stands and flash brackets.

Specifications:
Material: Aluminum alloy
Female thread (inside): 1/4" & 3/8''
Item weight: 8g / 0.29oz

Package List:
1 * 1/4" Female to 3/8" Female Screw Convert Adapter