Keys for the entrance and back door are for sale as I replaced them. Entrance: Outer: 6.5cm x 6cm x 2.5cm (thickness) Inner: Diameter 5cm x 2.5cm (thickness) Back Door: Mounting surface: 7.3cm Key replacement due to moving. Perfect for lost keys or spares. Entrance: MIWA cylinder 1 key, dimple key Back Door: Doorknob Cylinder replacement, escutcheon 2 keys Applicable door thickness: 25-42mm I was surprised that the key replacement cost about 70,000 yen for both doors when I moved. However, I had to change them for safety reasons. At that time, the locksmith removed the old keys and put all the parts in a box. The box and instructions are for the new keys, but I think the installation method is similar, so I will include them. #cylinder #key #security #key