Bought this set in hopes that at least ONE of the keys would fit a tall secretary/bookcase I bought at auction. First tried some in the glass doors on the bookshelf on top. Yay, found a match! Then tried the same key on the roll top desk part - no luck, so tried a few more and YAY again, found another match. Then, tried both keys in the bottom drawers - no luck, but kept trying - and found ANOTHER match! 3 different keys needed for this ONE piece - and they were all on this ring!