The Agastat 7000 STD21Y-B is a durable snap-on wire marker designed for efficient cable identification. Featuring a sleek black legend with the designation "B," this marker is perfect for organizing cables in any workspace. Its straight marker cut ensures easy installation, and it is compatible with cable diameters ranging from 11 to 15.5 mm (.433 to .61 in). Made for high-performance applications, the STD21Y-B is a reliable solution for labeling wires in industrial settings. Upgrade your cable management system with this top-of-the-line wire marker.