The Extech TL708 Alligator Clip Set has toothed jaws for the solid gripping of fine wires. They are heavy duty alligator clips with a 1000V, 6A CAT IV-600V and CAT III-1000V safety rating. Each have a one inch jaw length and a 1.6 inch jaw opening. The overall length of these alligator clips is 4.2 inches.