Staedtler 510 50 Plastic Single-Hole Sharpeners Single Piece. Easy to use & reliable. Easy to Sharp your Pencil. High Quality Sharpener. Strong Plastic Manufacture. Strong Blade of this Sharpener. Plastic sharpener, For standard-sized black-lead pencils up to 8.2 mm ? with a sharpening angle of 23ø for clear and accurate lines. 1 Piece Only. Color: Multi Color.