The RSRV (Reserve) Tool is a multi-use tool designed to hold your 510 thc or cbd cartidges, joints or magnetic adapters. Not only does it protect your cartridges from sunlight, water and breaks when dropping them, it also acts as a great weatherproof/crushproof storage container for your joints. Toss it in a bag, hang it on your keychain or just keep it in your pocket, this slim tool goes anywhere and is about as discreet as you can get. The top pin is even designed to reset the pins on your magnetic adapters ensuring you get a great cartridge to battery connection every time.