The Amprobe TL1500 test lead set contains two silicone-insulated lead wires, two standard probe tips, two alligator clips, and two spade lugs for connecting a compatible electrical test meter to a device in electrical testing applications. The 48? lead wires have silicone insulation to protect hands from shock and heat. The silicone insulation resists melting in hot environments and becoming brittle in cold ones, and it maintains flexibility better than polyvinyl chloride (PVC) insulation. The standard probe tips are held against the conductor during testing. The alligator clips (also called crocodile clips) have teeth that grip the conductor to provide a more secure, hands-free connection than the test probe tips. The clips are 3.15? long and have a 0.30? jaw opening. The spade lugs clamp to conductors with compression nuts or screws. The lead wires can be used with testing devices that have universal 4 mm jacks.