The Fluke TL28A Automotive Test Lead Set (Red and Black) feature large jaws, long leads and a piercing needle inside of the jaws - solid, spring-loaded copper clips with a wide 12.7 mm (.50 in.) jaw opening and serrated teeth. There is a large piercing needle for penetrating larger gauge wires located inside the jaws. 1.5 m (60 in.), silicone-insulated leads are useable from -80 °C to +70 °C (-112 °F to +158 °F); the set is rated for 30V, 10A.