The STD21Y-U is a high-quality snap-on cable marker sleeve designed for efficient labeling of wires and cables in industrial settings. This black, RoHS-compliant sleeve is part of the Agastat 7000 series, known for its durability and reliability. Featuring a straight marker cut and a universal "U" legend, this sleeve is compatible with cables ranging from 11 to 15.5mm in diameter. Perfect for organizing and identifying cables, the STD21Y-U is an essential tool for maintenance and repair technicians in various industries.