Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Parts Not Properly Machined For Use

Ok, I know we all get what we pay for, but I only have two doors to install...and right out of the gate, this kit failed me. Let's not even address the other reviewers comments (all accurate) on this kit. Here's what killed me: the 1" hole saw could not be installed on the supplied mandrel bit. The threads were not properly machined. The threaded 1" hole saw mandrel opening is *smaller* than the hole on the larger 2 1/8" saw because the threads are incorrect. Yes, the 2 1/8" threaded hole works fine on the mandrel. Maybe the kit should have included a vice and thread chasers...or maybe "buyer beware." Irwin was a "no-win" for me.