Narrowser 480pcs Heat Shrink Wire Connector Kit Waterproof Marine Automotive Terminals Set Male to Female Made with heat shrink tubing, the shrinkage ratio is 31. Forks, rings, hooks, quick disconnects, and butt connectors included in this set. Find the right connector for all electrical wiring projects Dual-walled design, polyolefin tubing in outside and hot melt adhesive in inside Allows visual inspection, prevents corrosion, and provided a waterproof seal. Standard crimp and then seal heat shrink butt connectors.