No. 1 Master Key by Master Lock
Features: Stock Master Key works with stock Master Lock Key System Nos. 1MK, 1NMK, 1KAMK, 1NKAMK, 1MKLF, 1NMKLF, 1KAMKLF, 1NKAMKLF, 1MKLJ, 1NMKLJ, 1KAMKLJ, 1NKAMKLJ, 1MKLN, 1KAMKLN, 1NMKLN & 1NKAMKLN 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).