Features: Secure Stacking The 21700 Battery Splicing Bracket offers unparalleled flexibility, allowing you to freely combine multiple 21700 lithium batteries to meet diverse power demands. Design with durability in mind, this bracket features a robusts support structure and efficient heat dissipation, ensuring safe and reliable stacking of your batteries. Ideal for enthusiasts and professionals who require customizable battery solution for various electronic projects. Perfect for use in workshops, laboratories, or any setting where versatile battery configurations is need. Crafted from high quality plastic, this bracket is easy to install and remove, making battery replacement or maintenance hasslefree while providing shock and pressure resistance for all environment. Specifications: Component:Plastic Hole Diameter:Approx.21.7mm/0.85inch Option Type:10pcs 1x4 Battery Holder,10pcs 1x5 Battery Holder, Package Includes: 10pcs 18650 Battery Holder note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.