That’s a TOYO-INTL 3 Ton x 3 Meter Chain Block - also called a "chain hoist" or "hand chain pulley"
What it’s used for:
Lifting and lowering heavy loads vertically. You pull the hand chain, gears multiply the force, and it lifts 3 tons with manual effort. No electricity needed.
Specs from the box:
1. Capacity: 3 TON - max safe working load. Don’t exceed this
2. Lift height: 3 METER - how much chain you get for lifting
3. Chain size: 8mm diameter load chain. Thicker chain = higher capacity
4. Weight: 25.2kg gross / 23kg net. These are heavy units
5. Brand: TOYO-INTL, GS + CE certified, "Japan Inspected"