Large jaws, long leads and a piercing needle inside the jaws. Solid, spring-loaded copper clips with a wide 12.7 mm (.50″) jaw opening and serrated teeth. Large piercing needle for penetrating larger gauge wires located inside the jaws. 1.5 m (60″), silicone-insulated leads, useable from -80 °C to +70 °C (-112 °F to +158 °F). Rated for 30 V, 10 A. One red, one black.