S.C. Code Ann. § 52-19-180
(A) Carabineers must be of the steel screw gate type with a breaking load of at least four thousand four hundred pounds and must be certified by a professional mechanical engineer as being in accordance with requirements of one of the following:
(B) Pulleys and shackles must have a minimum breaking load of at least four thousand four hundred pounds and must be certified by a professional mechanical engineer as being in accordance with the requirements of one of the following: