Bostitch SuperPro 6 Extra Heavy Duty Classroom Commercial Electric Pencil Sharpener, 6-Holes, Black/Gray (EPS12HC) 75% faster sharpening and 12x longer cutter life QuietSharp fan-cooled motor with thermal overload protection for quiet, stall-free use Tamper-proof safety switch shuts motor down when large, easy-clean shavings bin is removed Tip Saver Technology prevents over sharpening and extends pencil life One-hand easy-turn selector dial and oversized, die-cast metal base for superior stability