I put off the purchase for a long time thinking I could do without it; But now that I have them, I don't want to be without them! This set contains a large number of the most common sizes for use in racing cars or other industries and is supplied in a handy carrying case. Clecos make it easy to work with any panel, be it body, sheet metal or even Lexan windows. No more cumbersome clamps or vises as Cleco precisely and securely clamps the workpiece during assembly and fabrication. I suppose if you're a constant fan of sheet metal you'd want more and maybe some custom sizes, but for my small shop this is perfect. If you do any sheet metal work I would recommend it.