31 Piece 1/4" Sata Bit Set was a great suggestion for an all in one 1/4" bit expansion kit, with which They can handle just about ANY situation you come across as a handyman, DIY enthusiast and/or more variety in your hand tool box. A bonus was that Sata included a magnetic bit holder for use with your drill, but I found it extremely useful as an extension cord for my Fix It Sticks multi-tool. ADVANTAGES: - 30 piece set includes almost all standard 1/4" bit sockets - Sat includes a magnetic bit holder for your drill press. Sata offers a compact, labeled plastic case to store your bits. DISADVANTAGES: - 1/4". Bits weren't all the same size; some were too big to work with other non-Sata 1/4" bit instruments. However, I've only listed one downside - it's a bit of a downside as my batch has sizing issues (tolerance) which meant I could be missing about 20% of the bit on my other 1/4" tools. I would like to point out that every bit included in this set worked with a magnetic sata bit holder That's why I rated this product 3 stars out of 5.