Carbide Replacment Blade - Left These are carbide replacement blades for the Smith's JIFFY-Pro Sharpener (item #50185), Smith's Pocket Pal X2 Sharpener and Survival Tool (item # 50364 & 50411), and Smith's JIFF-V-Sharp Knife & Scissors Sharpener (item # 50170 & 50270). Tungsten Carbide Blades put a quick sharp edge on dull or damaged knives. These carbide blades are precision ground to provide a smoother, more consistent sharp cutting edge on your knife blade. They also sharpen your blade quicker than standard carbide blades. There is a left side blade and a right side blade, so you have to purchase both blades for replacement. C10013 is the left side blade.