Use GoodAll 14-500 replacement clamps when replacing clamps on starting units and heavy booster cables.  They feature solid copper jaws and heavy springs for high current surges.  Rated at 500 amps, these clamps are appropriate for heavy duty boosting up to semi tractors.  Skin packed 1 pair per package for convenience.

Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov