No. 4 Master Key by Master Lock
Features: Stock Master Key works with stock Master Lock Key System Nos. 4MK, 4NMK, 4KAMK, 4NKAMK, 4MKLF, 4NMKLF, 4KAMKLF, 4NKAMKLF, 4MKLH, 4KAMKLH, 4NMKLH & 4NKAMKLH 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).