This is a hand winch power puller, often called a "come-along" tool.
It is designed for heavy lifting, lowering, pulling, and stretching tasks.
It typically features a dual-gear mechanism for smooth operation and durability.
The tool has an anti-reverse mechanism and spring latches on the hooks to secure the load.
Commonly available in pulling capacities of 2 to 5 tons (4,000 to 11,000 lbs).