These extra-heavy duty battery clamps for 4/0 gauge cable are rated at 1400 amps to accommodate even the biggest boosting requirements.  They feature power jaw clamps.  A cable that runs to each side of clamp powers both jaws and allows higher amperage flow. Installs easily in the field with a simple butt connector crimp. Butt connector is already installed ready to accept your cable and crimp, shrink tube (red & black) is packaged with them for a clean finished look.