" Design accuracy: 1/4"" external thread to 1/4"" external thread, 1/4"""" to 3/8"" external thread, 1/4"" external thread to 3° internal thread 8"", 1/4""" female 3/8""" female adapter, ball head mounting ball head. Function: MiMoo Tripod Screw Adapter Kit can be attached to a variety of different photos, converter screws meet most of your cameras and other accessories! li> Economical and practical: All tripod screw adapters can be freely assembled to meet the requirements of various required adapters. With these adapter sets you don’t need to buy another camera adapter. Durable material: The 1/4 """ internal thread to 3/8""" aluminum alloy internal thread adapter, other adapters are stainless steel, strong and durable, the color is silver. li> Multi-connection: The shoe holder can be mounted directly on the DSLR shoe holder or on the brackets-/cages to create your configurations. This is an international standard precision thread adapter from 1/4""" to 3/8""".