Multiple padlocks that work with the same key, known as keyed alike padlocks, often come in packaged sets. The designation "KA" in the product number indicates a set of padlocks that use the same key. Keyed alike padlocks are convenient and minimize the number of keys that users must carry.
Locksmiths and lock companies can often provide additional padlocks that open with the same key as well as additional keys to fit existing padlocks if the customer provides them with the key number. Keyed alike padlocks are only available within the same brand.
Keyed different padlocks are padlocks that each require different keys. This is the default type of keying in padlocks from manufacturers such as Master Lock and American Lock.