Excellent quality and it's so nice to have all these sizes. Make sure you order from a seller that has the "new" version. They have the stair-stepped "speed slots" to use a screwdriver to remove the plug. Also, the old version (which the hole saws are painted completely white, ie no black teeth) have HOLLOW shafts on the mandrels! Those are total crap quality, but the redesigned mandrels have solid shafts and are great! (FYI, there are still more sizes Lenox makes that aren't included in this kit!) They are available at certain box stores.