What is this?Battery holder brackets are made of ABS plastic, suitable for DIY battery combination, also important parts of maintaining the batteries.What will I get?The battery holder brackets, we provide here, is in the size of Hole Diameter: 18.4mm/0.72 inch; Hole Distance: 19.5mm/0.77 inch; Size: 80mm x 22mm x 9mm/3.15 inch x 0.87 inch x 0.35 inch(L*W*H); Color: BlackIn the package of 10 x Battery Holder BracketAre 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.