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tool steel...once it looses it's birr on the cutting edge it's dull..you need to regrind it making sure not to take off the birr on the top edge that the grinder leaves...that birr is like a razor and it'll cut wood very well instead of chipping the wood off......you'll see a big difference in how it cuts...I always kept 3 or 4 cutters at hand to change out when one gets dull...then I'd take some time and regrind them all when I ran out of sharp ones.....tool steel bars are only like 2.00 each..their cheap and I'd grind both ends while I was resharping them....
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