STAEDTLER TUB PENCIL SHARPENER SINGLE HOLE. These tub shaped pencil sharpeners are designed to sharpen your pencils quickly and easily with a minimum of mess. They feature metal sharpener insert, hinged cover to prevent shavings from spilling, and lid with safety locks to avoid accidental openings. Single-hole sharpener has one sharpener for standard-sized graphite pencils up to 8.2 mm. in diameter. Blue top with silver body.