Key Size Requirements: KeySmart key holder accommodates up to 8 flat standard-sized house keys (max of 80mm long and 2mm thick each) and can be expanded to hold up to 14 keys using the included expansion kit. It is a perfect keychain for keys. KeySmart compact key holder is easy to assemble, no tools required, holds all of your existing keys. It is a ridge keychain at the same time a perfect key holder for car key. It comes with a Loop Piece attachment for your larger car keys or car fob remote. Say goodbye to bulky keyrings, annoying thigh pokes, and key jingle for good - organize that mess and free up your pockets now. KeySmart has a collection of compact and potable key organizers - KeySmart Classic, KeySmart Rugged, KeySmart Pro, and KeySmart Max. KeySmart's ultra light, compact body is built with aircraft aluminum frames and stainless steel hardware - the patented S-shaped design makes carrying your keys delightful. A truly sleek keychain men definitely love! The Perfect KeySmart Accessory: Create a reliable utility organizer keyholder with a wide range of our KeySmart mini tools to choose from, such as the; Quick Release Keychain, Bottle Opener, Pocket Clip, MultiTool, NanoPliers, and many more.