As an automotive technician I use this when working on old carburetors. The kit includes a pin vise that is very comfortable to hold and holds the drill securely in place. The kit also includes a set of color-coded twist drills in a dedicated case. The set contains several packages with several bits. Only 57 pieces. The bits appear to be of high quality as they were sent to work with the carburetor as soon as they arrived. I cut through butter like a hot knife. Very nice clean cut. My wife saw them and asked if she could use them in her craft so this set has many uses. It took me a long time to buy these.