This is a hi-hat clutch made by Gibraltar (ジブラルタル). According to the manufacturer, it's equipped with a spring and a ball bearing lock sleeve, allowing for one-touch cymbal attachment. It allows for quicker installation than screw-type hi-hat clutches. You can find instructions on how to install it on video-sharing websites. It's also compatible with hi-hat stands from various manufacturers, making it very user-friendly. It has been used to some extent, but it's not something that easily gets scratched or broken, so it's relatively clean. There are no particular problems with its use.