The Mobile File Cabinet from Mount-It! is designed to fit neatly under your desk and is fashioned in white to blend in with most environments. It's made of steel and sits on caster wheels that roll on hard surfaces as well as carpet. The top drawer is suitable for pens, papers, and other common supplies. The middle drawer offers deeper storage space for larger items, and the bottom drawer can fit both legal and letter-size hanging file folders. A lock is built into the drawer at the top right. A key comes included.