Flat pin key ring size: outer diameter 25mm, plane split design. The circular bisecting ring is suitable for connecting buckles, pendants, chain rings and other accessories; it is convenient and convenient to carry. The flat key ring is tightly closed to safety, without worrying about slipping off the key ring. Metal key ring is suitable for a variety of different items. They are very suitable for storing your car keys, house keys, office keys, hanging cards, hanging buckles, dog tags, etc.