ITEM NAME:2Pcs 18650 to 26650 Battery Converter Case Sleeve Adapter Plastic FT This item is for what use. Features: Material: PVC Inner diameter: 0.71 in / 1.8 cm Outer diameter: 1.02 in / 2.6 cm Length: 2.48 in / 6.3 cm Convert 18650 battery to 26650 battery Nothing complicated, just stick the 18650 battery in the converter and it's the same as a 26650 battery Perfect for electronics and emergency situations NOTE:ï ¼Ë†battery is not includedï ¼â€° Item: 18650 to 26650 Battery Converter Case Sleeve Adapter White Dimensions: =2.48 in x 1.02 in x 1.02 in (6.3 cm x 2.6 cm x 2.6 cm) Weight: 0.25 oz (7 g) Note: Lighting, display and other factors may cause COLOR SHADING, please comprehensive pictures and text descriptions to determine! Package Includes â— 2 x Battery adapter.Convert 18650 battery to 26650 battery. Item: 18650 to 26650 Battery Converter Case Sleeve Adapter White. â— 2 x Battery adapter. NOTE:ï ¼Ë†battery is not includedï ¼â€°. This item is for what use.