Can You Copy Master Lock Keys. Theres an excellent video explaining the process here. The brand is Masterlock and like most other padlock keys I believer are smaller than your everyday key.

Master Lock K400 Duplicate Cut Key for W400 6-pin Safety Lockout Cylinders. Theres an excellent video explaining the process here. An aluminum steel or brassbronze key blank would do the job but very cheap locks arent generally supported by key duplication services or locksmiths because its cheaper to replace the lock than to.
Its called key impressioning.
Lost your Master Lock Key. Having the right key matters. For this reason anyone who would like to duplicate a high-security key should reach out to. Yes we are an authorized Mul-T-Lock dealer that can sell and install the locks as well as provide copying of keys.

