Staedtler Noris 511 004 Sharpener Use for pin diameter: up to 8.2 mm diameter. Round plastic tin yellow black with hole closure. Metal sharpener insert with three-point knife fixation for better stability, longer durability of the knife, extended pen guide for better sharpening results, extra large recess for easier removal of broken leads, red lid with push buttons to prevent accidental opening. Dimensions (W x H x D): 40 x 56 x 42 mm. Pack of 10 in cardboard box.