(1) Shackles. You must ensure that shackles:

(a) Have permanently affixed and legible identification markings as prescribed by the manufacturer that indicate the recommended safe working load;

(b) Not be loaded in excess of its recommended safe working load as prescribed on the identification markings by the manufacturer; and

(c) Not be used without affixed and legible identification markings as required by (a) of this subsection.

(2) Hooks.

(a) The manufacturer's recommendations must be followed in determining the safe working loads of the various sizes and types of specific and identifiable hooks. All hooks for which no applicable manufacturer's recommendations are available must be tested to twice the intended safe working load before they are initially put into use. You must maintain a record of the dates and results of such tests.

(b) Loads must be applied to the throat of the hook since loading the point overstresses and bends or springs the hook.

(c) Hooks must be inspected periodically to see that they have not been bent by overloading. Bent or sprung hooks must not be used.