The M1 Rails will transform your current wallet into an all metal, ID wallet. This kit comes with a unique design and patent pending quick release rail mechanism allows not only easy access to cards, but also a way to expose and scan certain cards without removing them - extremely useful for displaying identification, badges or accessing secured buildings and public transportation.  This kit is intended to replace your single or bifold pocket that is already on your M-Series wallet.     One left and one right rail is included in this kit, in addition to a 1.050" hex tip key "L" wrench. With the hex tool, remove all screws and/or leather pocket on the frontal (or leather) side of an existing M1 Wallet. Replace it with the 2 rails and fasten them with 6 screws from the previous attachment.  Specifications & Features: 6061 CNC machined aluminum Holds up to 4 cards Compatible with M-Series wallets (Not compatible with D-series wallets & M1 Titanium wallets*) Not compatible with any Dango MT-series Multi-tools Includes x1 .050" hex tip key "L" wrench Replaces existing single, bifold pocket(s) or rails.  *Not compatible with M1 Titanium Wallets