Conversion Adapter Sleeve for 18650 to 21700 Cylindrical Holder Box Conversion Converter Tube

18650 to 21700 conversion cylinder, a practical solution for upgrading your power sources without the need for new batteries. Craft from plastic and metal materials, for long time use. Convert your existing 18650 into the larger 21700 size. Conversion Adapter Sleeve for 18650 to 21700 Cylindrical Holder Box Conversion Converter Tube Features: 18650 to 21700 conversion cylinder, a practical solution for upgrading your power sources without the need for new batteries. Craft from plastic and metal materials, for long time use. Convert your existing 18650 into the larger 21700 size. Perfect for use in a variety of electronic devices such as high powered flashlights and portable mobile power. Essential box holder cylindrical for your travel energy needs. Specifications: Component: Plastic+Metal Color: As shown Size: about 67x21mm/2.63x0.82inch Package Includes: 1Pc 18650 to 21700 Holder note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due