Each Alligator (Crocodile) Plug Connector has a crude spring with an excellent solid bite to clamp tight for long-term use without deformation. They have good electrical conductivity with a nickel-plated surface, thickened insulating sleeves, and a 2mm hole for inserting the wire. The PVC Red & Black colours help identify the positive and negative charges. They are versatile, suitable for DIY home or automotive uses, and come as a pair.
