Seamless Solid Barrel Connectors and Brazed Seam Terminals provide for a solid crimp with no barrel splitting. Translucent Heat Shrink Sleeve allows for visual inspection of correct wire placement. For Heat Shrink Terminals & Butt Connectors insert stripped wire into barrel of Terminal & crimp firmly, or into each end of Butt Connector & crimp firmly on each end. For Solder Butt Connectors strip ends of both wires and insert one wire completely through connector. Fray wire strands of both wires, intermingle & overlap ends. Carefully slide wires back through connecter, centering in middle of fluxed solder ring. Slowly apply heat (300degF) until inner adhesive wall of sleeve softens, melts filling voids, and outer wall shrinks. For Solder Connectors apply heat to sold ring first to melt and then to sleeve. Cool for a waterproof and corrosion resistant connection. Parts packed in a refillable Metal Kit.