Heat Shrink Bullet terminals protects splices from water and corrosion.Providing strain relief and against vibration in rugged environments，which excellently insulates and protects electronic connections. Copper barrel provides increased current flow, and ensures less voltage drop, preventing wiring failures and reducing equipment downtime. Thick copper barrel ensures a strong wiring connection every time. Your wire will never slip out of these heat shrink connectors. Package includes: Total 120 PCS Heat Shrink Male/Female Bullet Connectors.Wire range: 22-18 ( red ) / 16-14 ( blue ) / 12-10 ( yellow ) A.W.G., Wire range: 0.5-1.5mm² / 1.5-2.5mm² / 4-6mm²,Max current=19A / 27A / 48A. 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.