The Kood 58mm Centre-Pinch Snap-On Front Lens Cap with Keep cord has a squeeze, spring and snap-on mechanism. They're easy to put on and take off, especially when using a lens hoods and they stay on as intended. Lens caps protect your lens from scratches, fingerprints and dirt when the lens is not in use. This lens cap comes with a keep cord which you can attach to your camera when the lens is in use so you don't lose it.