2* 21700 Spacer
21.2mm - Fits most Samsung, LG, Murata 21700 cells
21.7mm - Fits most Lishen and other China manufactured cells
Lishen (LR2170LA) uses 21.2mm spacers.. All other Lishen models = 21.7mm
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.