The Kinetic Bottle Opener (V4 Serialized Collector's Edition) is primarily a key-chain designed to keep ones keys organized and accessible while remaining fully functional for opening capped beverages. These built-in openings allow the Kinetic Bottle Opener to slip into or over a garment pocket, keeping keys safely secured, and the finger loop oriented upright for accessibility. In the absence of pockets it can even be worn inside the waistband (think running or bike shorts). Women can use the carry slots inside the pocket of a purse. Included with purchase is an S-carabiner for quick removal of keys and keyring when needed. These are CNC machined out of aerospace aluminum to extremely tight tolerances for a beautiful show quality fit and finish. They are anodized matte black and laser engraved, each with its own unique serial number. It's also much thicker than our stainless steel tools. Specs: Matte Black Anodized Aluminum Kinetic Bottle Opener: Weight: 2.2 oz. Thickness: 11mm Length: 3.5" ​Width: 2.4" Disclaimer: It is also not a toy and should be used responsibly. Proper care and caution must be exercised at all times with this object, as with any and all objects to avoid injury to oneself or others. The manufacturer and seller assume no liability for misuse or improper handling.