The only reason I give one star is because I was able to make two gears, but it was the only cutter in the set that cost a penny. I make a half cut in a .300 wide aisle and it fires. Sharpen it with a sub head and same result. I tried using the wrong cutter to finish the gear and the rest was junk too. Wrote to seller asking for a new cutter and no dice. Not that I expected it, but I wanted to try. Buyer Warning.