This is a portable EDC knuckle guard that's convenient to carry with you and use in daily life. I once saw this product online, but thought it wasn't worth spending over $60 on, so I decided to make one myself. If you really want to use it to punch, I'm afraid you won't be able to deliver much force even after a few punches. So it's better to give it your all on the first swing and then quickly retreat. The aperture of the guard is about 22 mm. To make it easier for everyone to adjust according to their needs