Lock-n-Load Quick Change Extensions
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I have a 2" and 12" unit. They are nice in that they will take an insert tip as well as the ball detent tip holder, but the first 12" one locked exactly twice and then failed to hold anything, I got a warranty replacement but it has 1/4' or so of runout when inserted into a good 3 jaw chuck. I am going to have to return it too. I'm pretty much done buying Irwin because I have had too many problems with bits holding edges too. The one star is for engineering.