Standard crimp and then seal heat shrink butt connectorsGuaranteed to hold the strong crimpsDual-walled design, polyolefin tubing in outside and hot melt adhesive in insideAllows visual inspection, prevents corrosion, and provided a waterproof sealFor best results use a hot air gun until it reduces in size and the adhesive flows, filling gaps within the terminalSpecifications:Colors:RedSize: Red connector: Suits cable/ wire sizes 0.5-1.5mm218-22 AWGPackage includes:20 pcs X Heat Shrink Butt Connectors