Product Name: Astrolux DIY Body Tube Model: Fish-scale Big Lattice Type & Square Small Lattice Type (2 Types available to DIY) Size: 55mmx 35mm (Lengthx Diameter) (Size of 4x 18650 batteries) Color: Black Suitable for: Astrolux MF01 / MF02 / MF04 LED Flashlight
Specifications:BrandCONVOY NamePCB Board SeriesSize18mmFeatures:-Connect two flat-head 18650 batteries in series. -Increase the length to fill the gap..