No. 3 Master Key by Master Lock
Features: Stock Master Key works with stock Master Lock Key System Nos. 3MK, 3NMK, 3KAMK, 3NKAMK, 3MKLF, 3NMKLF, 3KAMKLF, 3NKAMKLF, 3MKLH, 3NMKLH, 3KAMKLH & 3NKAMKLH 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).