Features: Securely holds 18650 batteries in place during welding with a precise engineered ABS plastic frame, ensuring stability and alignment for safe, efficient battery pack assembly. It offer 3, 4, 6, and 10 cell configurations for customizable battery arrangements in electronics projects and professional applications. Essential for electronics engineers, battery pack manufacturers, and diyer hobbyists working with lithium cell clusters or energy storage systems. Perfect for creating power banks, repairing electric device batteries, or organizing cells in solar energy projects and remote control equipment. Heat resistant ABS construction maintains structural integrity during repeated use, while ergonomic clips enable tool less installation for streamlined workflow optimization. Specifications: Component: plastic Specifications: 3 holes, 4 holes, 6 holes, 10 holes 3 holes: Approx. 4cm/1.57inch 4 holes: Approx. 4cm/1.57inch 6 holes: Approx. 12x2.6cm/4.72x1.02inch 10 holes: Approx. 10x4cm/3.94x1.57inch Color:Black Package Includes: 4pcs 18650 Battery Holder note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.