No. 5 Master Key by Master Lock
Features: Stock Master Key works with stock Master Lock Key System Nos. 5MK, 5NMK, 5KAMK, 5NKAMK, 5MKLF, 5NMKLF, 5KAMKLF, 5NKAMKLF, 5MKLJ, 5NMKLJ, 5KAMKLJ & 5NKAMKLJ locks.
Special Ordering: If you require any master key keyed to an existing key number or lock please leave a note in the Comments Box upon checkout (you can also immediately reply to the Confirmation E-mail with special order instructions).