Case approximately 7 x 3 cm. Used only once. It is a beautiful item, but since it is a used item, please refrain from purchasing if you are looking for perfection. This is the "mounting hardware (haiyou kanagu)" used when wearing decorations and commendations. Details regarding the mounting hardware are as follows: Purpose: Hardware for attaching decorations and commendations to uniforms and formal wear. Importance: It is considered an essential item when entering the Imperial Palace, such as when meeting with His Majesty the Emperor.