Section 127(a) in U.P. Building And Other Construction Workers (Regulation Of Employment And Conditions Of Service) Rules, 2009
(a)all chains other than bridle chains attached to derricks and all rings, hooks, shackles and swivels used in hoisting or lowering of such derricks are effectively annealed under supervision of a competent person at following intervals, namely -(i)such chains, rings, hooks, shackles and swivels which are riot more than twelve and a half millimeter of length are so annealed at least once in every six months; and(ii)all other such chains, rings, hooks, shackles and swivels are so annealed at least once in every twelve months :
