Product overview: TLK281 -1, Automotive Test Lead Kit Complete set of test and measurement accessories designed especially for automotive specialists. Use the sharp stainless steel probes to contact the wire conductor or pinpoint tests on a circuit or relay, and the large jaw alligator clips to get a good ground on the engine or to connect to the battery terminals. An extra long set of alligator clips easily grip to the alternator BAT terminal or the S terminals. The set comes with silicone test leads and a case to keep it organized.