This is a hand-operated hydraulic crimping tool, often used for heavy-duty electrical connections like battery terminals or cable lugs.
The tool typically includes a set of interchangeable hexagon dies to accommodate various wire gauges, commonly ranging from 12 AWG up to 2/0 AWG or 4-70mm2.
It operates by generating hydraulic pressure to compress the terminals, featuring a pressure release switch for easy removal of the crimped wire.