Staedtlers Mars Rotary offers a stylish addition to any desk and what's more, it doesn't need batteries or a power cord like so many desk sharpeners. Suitable for all round, hexagonal and triangular pencils up to 12mm in diameter. Features a point adjuster: use sharp and long for black lead pencils, and blunt and short for coloured pencils. It has an automatic sharpening stop built in, so there's no risk of getting carried away. A clamp ensures the Mars Rotary won't slide around the desk.