Machined key hole for various attachments

but will also fit any pen that is up to 11mm in diameter

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Replace your classic Carpio 2

A10 Pocket Adapter | Bifold dango a wallet only Machined key hole for variousA10 Bifold Pocket Adapter The A10 Bifold Pocket allows your Adapt wallet to hold up to 9 extra cards. Made of either full grain leather or DTEX non leather material. The A10 Bifold Pocket also enables you to holster a pen and notebook for on the go easy access. Features: Holds up to 9 cards Pen pocket (pen sold separately) Available in both leather & DTEX material Adapter with polycarbonate sliding plate Exclusively compatible with A series wallets.