S.C. Code Ann. § 30-1-170

All officers of the State and of counties and municipalities who are required to keep books of record may make use of loose-leaf record books for these purposes. The loose-leaf record book used must be one that can be locked and sealed when the book has been filled to its capacity with the proper pages of records, and the key to the book must always remain in the custody of the official in charge of the books of record.