The THOMAS & BETTS RC610 terminal block markers are pre-printed with horizontal even/odd numbering from 1 to 20, simplifying identification and organization of terminal blocks. Constructed from durable polyamide, these markers offer excellent resistance to chemicals, heat, and abrasion, ensuring long-lasting legibility. They are specifically designed for use with SNA double deck terminal blocks, enhancing clarity and reducing errors in electrical systems. These markers contribute to improved maintenance and troubleshooting efficiency in industrial and commercial settings.