S.C. Code Ann. § 16-11-30: Possession of master keys and nonowner key sets.

(A) As used in this section:

(1) "Master key" means a key which unlocks more than one locking device.

(2) "Nonowner key sets" means a set of keys designed to open locking devices in a group of products, machines, or vehicles of a particular manufacturer, which differ in configuration from the keys issued by the manufacturer at the time of sale for the locking devices.

(B) A person who has in his possession, actual or constructive, while engaged in the commission of a crime against the person or property of another, a master key or nonowner key set as defined in subsection (A), or if a master key is used in the commission of any such offense against the laws of this State, he is guilty of a misdemeanor and, upon conviction, must be imprisoned not more than three years.