This credit card holder insert works pretty well. It fits my trifold wallet (a wallet that folds in thirds). There's a plastic tab that fits into a slit in my wallet and holds the windows to the wallet. The insert has 6 windows that are front-loading, which is convenient. Each window holds a max of 4 credit cards. But 4 is really too tight to get the cards in and out easily. The windows are a really tight fit -- I had to cut a couple of the paper ID membership cards to make them fit. So, not perfect but workable.