This is a Tolsen 10" (250mm) industrial water pump pliers, model EP-50148. Key specifications and features include:
Made from durable Chrome Vanadium (CrV) steel.
Features an adjustable jaw and black finish.
Equipped with comfortable two-component plastic, non-slip handles.
Suitable for mechanical maintenance and hydraulic pipework.
Used for tightening and loosening nuts and bolts.