J-Chen Fireproof Material 4x5 Cell Spacer 18650 Lithium Battery Plastic Holder Bracket
Material: ABS plastic + Poly-carbonateSize Approx: 10  8  0.8cm/3.94" 
3.15"  0.31"Pore size: 18.4 mmFireproof: Made of fireproof material, Non-
flammable, it will automatically extinguish when encountering an open flame,
effectively reducing the occurrence of fire accidentsAfter-sales service: We
strive to provide you with high quality and convenient service. You are
welcome to contact us if you have any problem about our product, we will give
you a satisfactory replyPackage include: 20 x lithium batteries Plastic holder
 
Product Features
  

         
[Size:] 100 * 80 * 8 mm, Pore size: 18.4 mm
         
[Material:] ABS plastic + Poly-carbonate, can withstand high drop, high strength support, easy to heat dissipation, convenient combination, fixed specifications, and free combination
         
[Fireproof:] Made of fireproof material, Non-flammable, it will automatically extinguish when encountering an open flame, effectively reducing the occurrence of fire accidents
         
[Professional:] With professional battery holder to replace the traditional general adhesive, which would brings convenient combination and more firm connection, as well as brings convenient maintenance of the battery.its the best choice of the battery combination
         
Every two 18650 battery cells needs 2 Spacers (one up / one down)