High-quality materials: This set of external thread conversion screw adapter is made of high-quality aluminum alloy, with surface electroplating, which has the functions of wear resistance and oxidation resistance, and prolongs the service life. | Application range: 1/4 to 3/8 inch adapters can be used as conversion screws, which can be manually screwed onto lamp sockets or tripods, and connected to camera flash triggers, conversion base flash hot shoe bottom connections, etc. | Unique design: This set of products uses 1/4 screws on one end and 3/8 screws on the other end, making it versatile and practical. | Wide application: can be connected to a range of different photography accessories, such as studio light stands, hot shoe/cold shoe adapters, ball heads. | Product size: The size of the external thread conversion screw is 18 x 70mm.