Product arrived promptly however, because the threaded male portion of the adapter actually has a hole drilled down the middle, the adapter as a result is VERY weak. When the adapter was tightened into the mount, it broke right off leaving the threads in the hole of course. Removed the threads and tried another, it also broke right off once tightened and I did not tighten it to gorilla specs either, just enough to tighten it against a stainless steel lock washer. I tried these because the ones we have been buying from another vendor were out of stock so we thought we would give them a try, not again. I threw the remaining pieces in the trash can.