The FLCP-72 Front Lens Cap from Fujifilm is designed for use with the FUJINON LENS XF10 to 24 mm F4 R OIS. It has a thread size of 72 mm. This lens cap protects the front element of your lens from scratches or abrasions. It can be easily screwed on the lens in seconds. When the lens is not in use, you can attach the lens cap to it and store it in your camera bag. It is extremely small in size. This enables you to conveniently store this lens cap in one of the accessory pockets of your bag when you are using the lens.