They were not strong enough to open the clamps as the cable jacket is squeezed before the clamp releases. Skip them and just use a few channel blocks or look for another brand instead. Purchased for use on GM radiator and heater clamps.
Pros
WIDE APPLICATION - This pliers wrench can remove clamps on cars, remove factory spring clamps, coolant hose pliers and radiator hoses; Automotive clamp pliers allow technicians to access flat clamps in hard-to-reach places