About this item PREMIUM QUALITY WIRE CONNECTORS KIT: 620PCS electrical connectors kit includes ring,fork,hooks,spade and heat shrink wire connectors to meet your daily needs.There are butt connector 70pcs,forks 70pcs,hooks 70pcs,spads 60pcs,female spades 60pcs,rings(10,1/4,5/16,3/8)270pcs and butt connector 26-24 20pcs.They are neatly packed in transparent boxes and can be easily identified by different color-coded tubes with wire gauge markings. WATERPROOF SEALING CONNECTOR:Unique double-wall design helps the marine grade heat shrink ring connectors to be sealed to the end of the barrel after heating, providing all-round protection. The outer polyolefin tube and the inner hot melt ring better isolate air and water. SAFE AND DURABLE:Each wire connector is specially designed for use in harsh environments.The translucent butt connectors uses thick tin-plated brass barrels to prevent wire corrosion and leakage. You can visually see the wires during operation and keep the wires firm during crimping. Make your work safer! SIMPLE AND QUICK OPERATION:Just put the Electrical Connectors into the marked jaws for crimping, and the rotary connector is heated with a heat gun. The heat-shrinkable tube will be reduced in size and glued to the wire. It is safe and simple to operate. The whole process can be completed in less than 15 seconds. WIDE APPLICATIONS:Professional battery terminal connectors have good conductivity and safety, which can be widely used in automobiles, ships and homes.And help correctly connect marine electronic equipment, vehicle maintenance, motorcycle audio, scientific research, equipment switches and other projects.