I have it too, and I'm not a fan. it only contains imperial bits. So you can't use it on any brand from the European mainland, that have metric screws. They break when you over torque them, instead of the screw. That's good with very old machines. What is bad us that they only provide one of the smallest bit which is most prone to breaking. And also I have many typewriters with even thinner slots on the slotted screws. the bit holder is very fat, making it very difficult to use in narrow spaces. And typewriters have a lot of those. You're better off with a gunsmithing set from Wheeler or Weaver. This is the one I ended up buying: https://www.weaveroptics.com/gunsmithing-tools/driver-and-hammer-sets/multi-bit-tool-kit/WV-849718.html