Eze-Lap Shirt Pocket Sharpener Tapered Diamond Sharpener is light and compact. You can take it anywhere. 2 1/4 tapered rod for serrated knives. 5 3/4" overall. Features oval and flat surfaces with fish hook groove." Tapered rod for serrated knives. Light and compact. You can take it anywhere. 2 1/4" rod. 5 3/4" overall.