This derwent twin hole sharpener features two holes for two different sized pencils 7mm and 8mm diameter allowing you to achieve the perfect point with an attached container the shavings will be caught and stored so that you can keep your pencils sharp wherever you are this container is easy to empty but will lock securely to prevent shavings spilling out it is also transparent so youll know when its time to empty out the contents this is a handy tool for professional school and hom