Brought this mainly for selection of spade and saw bits for cutting larger holes in manufactured board for cables to pass though, ended up using it as my collection of drill bits and my old set is gathering dust, used on metal, masonry and wood all are fine, nice fast cut, all seem to have remained in great condition with no rust yet i do look after all tools and maintain after use. not much more to say other than a really useful blow molded case that unlike others actually holds the bits, a nice cheap set for all :)