This article came about when I was looking for a door handle hole saw kit. Received the item and was impressed with the contents and the set comes in a nice durable plastic case. You get a good range of hole saws for the price, each deeper than average depth allowing for more applications. On the other hand, there were no instructions for mounting hole saws on mandrels, and of course that is not to be taken for granted. More importantly, while this is a great deal for other applications, it's not a doorknob installation kit. It lacks a leveling device for installing doorknobs, making it rather unusable for these applications. Even though this is a great deal and high quality I will be returning it for a genuine doorknob kit with leveling tool.