They fit around the head of small padlocks keys, suitcase keys, file cabinet keys and any other small keys. The maximum size key they will fit is the standard Master padlock M1 key blank, which is just slightly larger than a penny.
Ten Small Lock Keys, Vintage Jewelry Box Padlock & Mailbox Keys, Skeleton Keys
Florence Blog Florence Mailboxes
Key Ring Identifiers
Kaba Ilco 1646R Key Blank (50-Pack) Material: Nickel Plated Brass Use: Various Mailbox Lock Applications
Key Blank For Usps Mailbox Locks (1646R)
Mailbox Locks - Ace Hardware
Key Identifiers Bulk
【Convenient and Safe】Fingerprint padlock with key backup can record up to 20 different finger, your finger is the key, and it only takes 0.5 second
Fingerprint Padlock, Smart Padlock with USB Charging Support, Fingerprint Lock, Biometric Lock Suitable for Luggage, Bookcase, Suitcase, Backpack
Key Ring Identifiers
Key Ring Identifiers