I liked everything about this set of micro tools. It is made from S2 tool steel which is flexible enough not to break when tightening screws or bolts down. It is also suited for small impact tools; its Rockwell Hardness of HRC 54-56 is not the hardest tool steel by any means, but it is plenty hard for the size of these driver bits. It is also the most common hardness for high-end French Chef's knives because it is easily sharpened and holds an edge well. The hardest steel is not always the best for tool steel for all applications. It has to have some flexibility, or it can chip or break. The steel specs of this toolset are perfect for their purpose. All the pieces fit snugly enough in their case to not fall out, yet are easily removed and replaced. It has an immense selection of driver bits included, perfect for computers, electronics, and even watch and eyeglass repair. It has sockets and wrench ends as well. I was impressed that it has magnetization and demagnetization slots as well. Included are a pair of fine-point tweezers and a double-ended paddle. There is a selection of long bits and a flexible extender. The handle is excellent, made with good grips and a rotating hand end to facilitate constant turning without losing connection with the screw, bolt, or nut. The case is extremely well-designed and made. It allows all 128 pieces to fit in a sturdy plastic articulating tube that folds up into an amazingly small footprint only a few inches across. It will definitely help keep the 128-piece set organized. Its Amazon.com web page has good, accurate pictures and a good video. Its price point is very reasonable. I am extremely happy with all aspects of this product, and I highly recommend it. Read more