Crane hooks are generally made of 

Explanation:

Crane hooks:

• A lifting hook is a device for grabbing and lifting loads by means of a device such as a hoist or a crane.
• A lifting hook is usually equipped with a safety latch to prevent the disengagement of the lifting wire rope sling, chain, or rope to which the load is attached.
• Generally crane hooks are made from wrought iron or steel.
• For heavy-duty crane hooks low alloy steels are used but the material is not the only factor behind its enormous load-bearing capacity.
• Steel grade, heat treatment, and forging are equally important to make a durable crane hook.
• Proper forging is very important. Forging provides better structural integrity than any other metal working process.
• It eliminates any kind of defects such as gas pockets or voids in the hook which can affect its long-term performance; thus increasing its strength, toughness, load-bearing capacity, and fatigue resistance.