Reduction ALF-18 for using Li-ion battery 18650 in flashlights with larger Li-ion batteries 21700. Quality construction from PC and ABS. Contacts coated with copper for perfect conductivity. Dimensions: 61.2 mm x 21.5 mm. Weight: 6.1 g. Suitable for use with battery 18650 in flashlights Fenix PD36R, PD40R V2.0, HT18, TK22 V2.0 and TK22 UE. Battery 18650 is not included.