Review on CMT 796 001 00 Router Extension Collets by Marty Orthodontics

The extension caused the cutting head I was using to vibrate so much that my hands went numb the next morning after using the router that contained it (it was fully seated, and I've never had a problem with batting). In addition, it "jammed" after several days of use (there wasn't much to choose from). I couldn't get the bit out and my $60 router bit required me to hold it in place with a vise, hammer and assorted wrenches. Upset and disappointed with this purchase but at least I was able to get the job done. I had to do.