180 PCS Wirefy Heat Shrink Butt Connectors &ndash; Waterproof Wire Connectors - Automotive Marine Grade Electrical Terminals &ndash; Crimp Butt Splice Terminal Kit DURABILITY - The barrel is created from one seamless piece of copper that eliminates the problem of the barrel opening. Translucent heat shrink tubing provides high tensile strength as well as resistance to stretch and mechanical damage WATERPROOF - Insulation tubing has unique dual-walled design: polyolefin tubing on the outside and hot melt adhesive inside. When heat is applied, polyolefin tubing reduces in size and adhesive flows inside the insulation. Dual walled tubing ensures waterproof seal and prevents wire corrosion EXCELLENT WIRE CONTACT - copper barrel provides increased current flow, and ensures less voltage drop, preventing wiring failures and reducing equipment downtime. Thick barrel ensures strong crimp every time - your wire will never slip out of the connector EASY IDENTIFICATION - Color-coded tubing with wire gauge imprint makes it easy to identify the right size of the connector for every application. Measure your wire, and easily choose the right connector by looking at wire gauge imprint on polyolefin tubing WIREFY BRAND QUALITY COMMITMENT - Whether you are working on your boat, vehicle, home or scientific project, our Heat Shrink Butt connectors will ensure strong crimps, increased current flow and waterproof connections every time! Start making durable, secure and waterproof connections today!