Features: Ensuring a snugs fit for 18650 batteries within 21700 sized flashlight compartments with this ABS adapter sleeve, enhancing stability and connection. ABS componnet, providing a lightweight yet efficient solution to prevent battery rattling and ensure proper alignment. Universal accessory for flashlight enthusiasts and professional requiring power sources. Whether you're camping, hiking, or involved in any outdoor adventures, this adapter allows you to use your 18650 batteries in larger 21700 flashlights easily. Essential adapter sleeve – a must for anyone to optimizeing their lighting equipment. Specifications: Component:ABS Size ：61.5x21.5mm/2.42x0.84in For 18650 to 21700 Battery Sleeve Only Quantity: 1/3/5/10PCS Package Includes: 1PC Battery Sleeve note: Please allow 0-1cm error due to manual measurement. please make sure do not mind before bid. Due to difference between different monitors, the picture may not reflect the actual color.