When I received my new Bosch Drill I hadn't realised that all of my old drill bits would not be compatable with it, so I bought some new SDS masonary bits.Just as I was considering throwing all (quite a large number) of my old bits away and downbeat at how much it was going to cost me to replace them, I heard about this adaptor. What a God send, easy to fit and remove, plus it does the job it was bought to do in a more than adequate fashion. Additionally I can now use all of my 'old' drill bits until they are worn out. One heck of a buy. Congratulations to the inventor.