This is a mini utility knife/edc/amazon-package-opener for your keychain. It uses mini blades like these from amazon:

Mini Blade: https://www.amazon.com/CML-Supply-Utility-Knife-Replacement/dp/B001IEBONO

• The base has a slot for a 5mm wide by 3mm thick magnet that holds the blade securely closed. I use a drop of glue before pressing the magnet in place
• Additionally you need a 3mm nut and bolt. The nut can be glued in place and then the 2 halves can be screwed together, this is how you'll change the blade too.
• the top piece and slide are printed together.
• MINI!