Crystal Clear Heat Shrink Sleeve allows for a visual inspection of wire placement, proper crimp and inspection of wire condition over life of the connection. Seamless Barrel provides for a solid crimp with no barrel splitting and is Yellow Striped indicating 12-10 AWG connector and where to crimp mark. Wire Stop prevents over insertion of wire. Insert stripped wire into each end of connector barrel & crimp firmly on both red stripes. Slowly apply heat (212degF) until inner adhesive wall of sleeve softens, melts filling voids, and outer wall shrinks. Cool for a permanent waterproof and corrosion resistant connection.