The PANDUIT PCM-21 wire marker card is a versatile solution for identifying wires in various industrial applications. Constructed from durable vinyl cloth, these cards provide clear and lasting identification. The '21' legend is pre-printed, simplifying the marking process and ensuring consistency. The plastic liner protects unused markers and facilitates easy removal. Suitable for wires with a maximum outer diameter of 0.38 inches (9.5 mm), these cards are ideal for project builds and maintaining organized wiring systems.