Derwent new desk sharpeners have a durable helical blade which sharpens pencils to super points for fine detail work. Suitable for pencils up to 8mm in diameter. The extendable front plate has a self feeding mechanism which stops when the pencil has reached a superb point. The transparent sliding tray reservoir is easily emptied and each sharpener comes with a desk clamp. Sharpens up to 8mm pencil diameters High quality helical blades Visible shavings reservoir Easy to empty via quick sliding front cover Comes with desk clamp