An aluminum sleeve is a small metal tube used to assemble, tighten, or form a loop on a steel cable. Flexible when crimped but strong once crushed with suitable pliers, it allows for reliable and durable connections without knots. Lightweight, corrosion-resistant, and economical, it is very common for galvanized or PVC-coated cables. It is used in particular for guardrails, guy wires, fences, light lifting systems, or any installation requiring secure cable fastening.