The THOMAS & BETTS D71 terminal block markers offer a convenient solution for identifying and organizing terminal blocks in electrical installations. These pre-printed markers, featuring horizontal even/odd numbering from 1 to 20, are specifically designed for use with SNA double deck terminal blocks. Constructed from durable polyamide, they provide long-lasting legibility and resistance to common industrial conditions. Proper labeling is crucial for efficient troubleshooting and maintenance, and the D71 markers contribute to a safer and more organized electrical environment. They are a vital accessory for electrical contractors and maintenance personnel.