That’s a 5 Ton Horizontal Lifting Clamp by TOYO-INTL
What it’s used for:
Lifting, moving, and turning steel plates, beams, and structural sections horizontally. The serrated jaws bite into the steel plate when you lift it with a crane/hoist. The weight of the load makes the clamp grip tighter — "self-locking" action.
Key details from your photo:
1. Capacity: 5 TON / 5000kg WLL - Working Load Limit
2. Type: Horizontal type - meant for lifting plates that stay flat/horizontal. Not for vertical lifting.
3. How it works: Attach shackle to the top hole → connect to crane hook → clamp grips plate → lift. When load is released, it opens.