I'll 2nd that! Re: Aloha's reply for the Corona sharpener being the Most superior striker.It will put out a minimum of a Full Handful's worth of sparks,from a ferro rod,Regardless of what type of coating it has,On the very 1st try!& It will sharpen your knives,Axes,Machetes,Hawks,etc.Regardless of Type of steel,Hardness/Density,Straight or Serrated!Truly a Dual-Purpose tool,I'll have with me,Forever!I do recommend your Ferro-rod be larger diameter than Standard 1/4"/5mm as,This sucker will wittle,Alot more than a little,lol!