Depending on the task, you can equip a cobot with mechanical, magnetic or vacuum grippers. They can move up to 14kg of weight within a 110cm radius.
Possible tasks are: sorting, packing, palletising, … A cobot is excellent at doing things that people find repetitive, mind-numbing and boring. But at the same time, it has a precision of 0.05 to 0.1 mm, so a cobot can also assemble, screw, glue, deburr, polish, … even weld.
In a typical collaborative setup, a cobot does the heavy or repetitive part of an assignment, while its operator takes care of quality control or more delicate details.