King ToolKPSC Premium scribe

Purchased this for scribing wall layout into concrete. The tip lasted just as long as any $3 scribe on the market- about 1 week. Tried to resharpen the tip with a grinder and I think the heat ruined it; they were only good for about 1 day after each re-sharpening. For the money, I'd buy 2 for $5 from Amazon.