Very disappointed with this hole saw set, especially as I trusted the "master" title. I was only able to use it once (size 1-1/4") before the hole saw got permanently stuck in the arbor and now I can't resize. I've tried W-40. I've had ratchets I tried the impact method. I tried the impact drill method. Not only did none of it work, I twisted my wrist, ripped my arms open and burned the motor in my drill. I spent $30 on this kit which I can't use, $100 for a new drill and $50 for a better hole saw kit Save yourself the hassle and skip this kit in favor of a better one.