I purchased this accessory to the Ridge Wallet. This accessory enables you to keep your most used card outside of the other cards that are inside the wallet. This card holder is very handy and I recommend that is you are purchasing a Ridge wallet, this is a must have accessory.
It is easy to use and install. One caveat though, it is comes with screws that are a tad longer than the ones that are already in the wallet. Make sure you use those screws instead of the shorter ones that are already in the wallet. It also has a small screwdriver that fits the mini screws exactly. There's no need to go searching for a screwdriver. I think the new, longer screws have an orange tip on the thread part to make them easier to identify, but, I may be mistaken.
Overall, the instructions for the Ridge Wallet and accessories are either very hard to find or nonexistent on Ridge.com. I had to search Google and YouTube to find out how to do some of the things.
While this is a problem, somewhat due to my ignorance, it won't detract from a five star rating. But it would be nice if the Ridge website had a How-To section.