No. 81 Master Key by Master Lock
Features: Stock Master Key works with stock Master Lock Key System Nos. 81MK, 81NMK, 81KAMK, 81NKAMK, 81MKLF, 81NMKLF, 81KAMKLF, 81NKAMKLF, 81MKLJ, 81NMKLJ, 81KAMKLJ, 81NKAMKLJ, 81MKLN, 81KAMKLN, 81NMKLN & 81NKAMKLN 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).