Diameter: 21.5mm / 0.85 inch; Length: 61.5mm / 2.42 inch; 64mm / 2.52 inch. Material: Plastic; Color: Clear, black; Package Include: 8 x AAA Battery 3x1.5V Storage Adapter Case; 8 x 18650 Battery Sleeve Tube. Plastic Battery Holder for 3 AAA For Flashlight. Connect three AAA batteries together in Series and output 4.5V voltage. These are good replacement gaskets to use with the 18650 battery in the LED flashlight. This sleeve prevents the inner wall of the flashlight from impact with the battery to protect the battery.