No. 312 Master Key by Master Lock
Features: Stock Master Key works with stock Master Lock Key System Nos. 312MK, 312NMK, 312KAMK, 312NKAMK, 312MKLF, 312NMKLF, 312KAMKLF, 312NKAMKLF, 312MKLH, 312NMKLH, 312KAMKLH & 312NKAMKLH 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).