Battery Holder Bracket 3 x 2 21.3mm Diameter for DIY Battery Pack of 10

What is this? Battery holder brackets are made of ABS plastic suitable for DIY 21700 battery combination also important parts of maintaining the batteries. Are there any advantages of the product? ABS plastic withstand high drop high strength support easy to heat dissipation fixed specifications. How to use it? You can put the batteries into the holes according to your requirement. What should I notice? Please check the size before you purchase. All above sizes are measured manually please allow +/-0.1 inch error.