Master Lock No. 1MK Series Lock 

The Master Lock No. 1MK Series Includes Factory-Built Master Keyed Padlocks, Where One "Master Key" (Sold Separate) Can Open All Of The Locks In Your Entire System (MK) While Each Lock, Or Group Of Locks, Can Still Maintain Its Own Individual Key Access:

• Master Keyed (MK): In A Standard Master Keyed (MK) System, One Master Key (Sold Separately) Will Open All Locks In The System, Although Each Lock Will Come With Its Own Unique Key.

• Master Keyed + Keyed Alike (KAMK): In A Master Keyed  + Keyed Alike System (KAMK), One Master Key (Sold Separately) Will Open All Locks In The System, But Each Group Of Locks Is Keyed Alike (KA) And Share Another, Different Key Number.

Extra Change Keys (Cut Key)

Extra Master Keys (Cut Master Key)