This 1x1 18650 Battery Spacer Holder is designed to securely hold a single 18650 Li-ion cell in place, ensuring stability and proper alignment in battery packs. Made from durable ABS plastic, it provides insulation and prevents short circuits while allowing efficient airflow for heat dissipation. The 18.5 mm bore diameter fits standard 18650 cells snugly, making it ideal for DIY battery pack assembly.