Total nonsense! You can't even use them. While the 1/4" shank of the raised plate bits will fit in the collet, the shank of the other two bits will not. Whoever ground up these pieces of scrap should be fired! The only way to fit the intended 1/4" shank into my 1/4" collet is to file or grind it, which I won't do. They just end up in the trash where they belong. If you are thinking of buying these, don't waste your time and money like me.