This Prym tool is a must have for any sewing enthusiast!  It makes belts, drawstring tunnels etc. incredibly easy and eliminates almost all hassle. Very simple yet highly effective.

Simply push the turner through the 'inside-out' fabric tunnel, open the small but robust hook and pull the fabric the correct way.

Also ideal for adding cord for drawstring requirements for e.g. round a hood or cargo trouser waist etc.