Heat shrink spade connectors are made of high quality tin-plated red copper, whose surfaces are plated with tin which ensures good conductivity and corrosion resistance；Matching pliers model: N-060 Heat shrink spade connectors made of premium polyethylene 3:1 heat shrink tube which will not break easily during contraction，It has strong corrosion resistance and will not soften and separate in the heated environment Heat Shrink Spade Terminlas Comes With Different Sizes:Red-AWG 22-16, 100PCS male and 100PCS female After the heat shrinkable tube is heated, the hot melt adhesive will shrink and penetrate to wrap the wire, thus achieving a sealed waterproof connection. The translucent protective cover can also be used to check the wiring accuracy. Heat shrink Spade Connectors are ideal for home and automotive applications, as well as industry requirements covering marine, domestic, industrial, electronics and more. Heat Shrink Spade Terminlas Comes With Different Sizes:Red-AWG 22-16, 100PCS male and 100PCS female