Craftsman's highly-rated 26-piece ratcheting multi-bit screwdriver set is on sale at Amazon for $16.98, around $8 cheaper ...
Binary Decision Diagrams (BDDs, see also Wikipedia) are a compact way of representing sets of numbers, so that certain set operations (e.g. union, intersection, complement) can still be executed ...
All sorts of tools can get the job done, but too many break when subjected to demanding home improvement scenarios and DIY projects. Not these ones, though.