What are limits of key in Aerospike?

Thank your for the answer.

Yes, I know that Aerospike automatically transforms key into a 160-bit hash.

I need to store in DB key. Also I need keys when do scan and query. It is possible to specify WritePolice with sendKey = true then Aerospike will store keys (WritePolicy sendKey effect).

I want to know if there are any limits of key length when I set sendKey = true for write policy?