Great little set. The assortment of bits should cover every "micro" project I come across. The bits are made from high quality 6150 steel and hardened (heat treated) to Rc 51/54 - I was pleasantly surprised. Bits should last a very long time, if not forever. The case that holds the bits and tools is very well thought out, with plastic ribs that prevent the bits from falling out when the lid is closed and secure. Bits and tools can be easily removed when opening the case. I am very happy with this purchase!