The 540-Piece Wirefy Heat Shrink Wire Connectors Kit Features Insulated Ring, WIREFY MOST VERSATILE CONNECTOR KIT - Ring, fork, hook, spade and butt splice heat shrink wire connectors are included in this multipurpose electrical connector kit. You will not run out of heat shrink wire connectors when working on your next wiring project. DURABILITY AND WEATHER RESISTANCE - Thick copper barrel ensures a strong wire crimp every time. Your wire will never slip out of these connectors. Adhesive lined heat shrink tubing provides high tensile strength, as well as resistance to weather, stretch and mechanical damage. Prevent wire corrosion in your electrical connections. EASE OF APPLICATION - Strip wire insulation, crimp terminal barrel with a wire crimper, and apply heat with a heat gun while rotating a connector. Heat shrink tubing will reduce in size and adhere to the wire. No soldering kit needed. Start making secure and durable connections in seconds. COMPLIANT WITH ALL ELECTRICAL STANDARDS - Wirefy heat shrink connectors are compliant with ROHS, ISO 9001:2008, SGS, CE and UL standards. Prevent wiring failures and reduce equipment downtime by choosing certified electrical connectors. WIREFY QUALITY COMMITMENT - We stand behind the quality of our electrical connectors. Our client experience team will work on every inquiry to provide comprehensive product support and ensure your complete satisfaction with Wirefy electrical connectors. Start making high quality connections today.