These leads from Fluke are built for use in automotive tasks and feature large jaws, long leads and a piercing needle built directly into the jaws of the lead.
The jaws have a wide opening of 12.7mm (.50") and the included piercing needled can be used to penetrate larger gauge wires. The test leads are 1.5m in length, allowing you to easily perform testing even at a distance.
The leads are rated for 30V and 10A. They feature standard 4mm connectors, meaning they can easily be used with a large variety of testing equipment such as multimeters etc. They're also suitable for use with testers that aren't manufactuered by Fluke.