Roll your wraps faster and tighter than you could with your hands.  A tighter roll means a tighter wrap on your knees.  It's portable, lightweight and easily fits in your gym bag.  Attaches easily to a bench or rack with a sturdy pipe-clamp.  The clamp rotates to make it easier to attach and roll with your stronger hand.  Wrap rollers are notoriously expensive and tough to make.  You won't find a roller even close to this quality for this price.