This is a microphone adapter part for the HyperX Quadcast, Quadcast S, and DuoCast. The screw thread is 3/8 inch. I used it for about a year. Perhaps due to poor manufacturing precision, there are some irregularities on the surface. Since it's a black part with black holes, it's not very noticeable. There are no problems with its use, it's just an aesthetic issue. To avoid complications with the listing settings, all shipping methods are set to regular mail (standard, non-standard), but please rest assured that I will change the shipping method depending on the size of the package, the price of the item, and the contents of the item. If you have any requests, please comment. I will ship using your preferred shipping method. In that case, there may be an additional charge, so please understand.