I am using this to clip my work ID badge on. It works great! I had been using a safety pin, but worry about damage to my scrub tops. I need to remove my badge at times to swipe through door locks. I don't like badge reels because they are too heavy. This works beautifully. The bar has enough clearance to easily clip/unclip my badge but it is still low-profile. It stays very securely. Those magnets are STRONG! I chose the one with crystals. It looks nice without being too flashy. I am concerned about the magnets affecting the information strip on the back of the card. I always store the badge still attached to the clip and not laying on the magnet. The info strip is at the bottom edge of the badge and continues to work fine. But, be advised...I did this at my own risk. I haven't had any problems, but your experience might be different.
Update: I changed jobs and now have to use a badge reel. I am still loving this product. I just put it on my shirt and clip the badge reel on it. It tolerates quite a bit of tugging before it moves. Even then, it just slides a tiny bit. No damage to my clothing. I have been using this same magnetic holder for about a year and it has held up great.