I received a pair of earrings from a friend who bought them in Australia, but they were larger than I expected, so I replaced the hardware myself. I purchased 20mm and 30mm (center in the photo) findings, but I didn't use the 30mm ones, so I'm listing them for sale. The material is K16GP. I put a stone through the bottom ones once. The Australian hardware (left in the first photo), with the stone removed, is thicker and sturdier than the Japanese ones. The material is unknown, but I think it might be brass. The size is approximately 57mm long for the larger one and 47mm long for the smaller one, measured by an amateur. The silver earrings on the right in the first photo were a gift from my sister, and the material of the hardware is unknown. The stone is amethyst, and you can remove everything from the end of the hardware. They are all on the larger side, but I hope someone who makes handmade accessories will find them useful.