Hooks are small pieces of hardware used for lifting loads. The integrity of the hook determines how much weight the load can bear before it fails.
Simple S-hooks are typically used for light lifting. Composed of a thin strip of brass or stainless steel, the hook can be pinched closed to secure a light load. They vary in length and gauge, which contribute to how much weight the hook can bear before failure.
Clevis slip hooks are much sturdier, composed of grade 70 carbon steel and able to bear working loads up to 6,600 pounds. They are outfitted with a one-way safety latch that secures a cable or chain into place. The chain slips through the hook, and the latch must be opened manually to release the load.