3* 21700 Spacer
21.2mm - Fits most Samsung, LG, Murata 21700 cells
21.5mm - Fits most Molicel, Lishen and other China manf. cells
Many of the spacers on the market currently are not flame retardant. They are made of cheap plastics which means that a battery fire could potentially spread through the spacers to other cells.
Our spacers are made up of flame retardant plastic.