The THOMAS & BETTS RC610 terminal block markers are pre-printed with even and odd numbers from 1 to 20, facilitating easy identification of terminal blocks within electrical installations. Constructed from durable polyamide, these markers offer excellent resistance to chemicals, abrasion, and UV exposure, ensuring long-lasting legibility. They are specifically designed for use with SNA double deck terminal blocks, contributing to efficient and organized panel layouts. These markers simplify troubleshooting and maintenance, reducing downtime and improving overall system reliability. Ideal for industrial automation, control panels, and power distribution systems.