But - and there really Amazon donates confusion - you can only "SDS" (and not even "SDS Plus" - which have a thicker stem) using drills and bits - * NOT * the advertised Amazon X-Line kits from Bosch. In the standard version, for example, does not include a 10mm masonry bit - the one has to get disconnected, and there must not be rashly click the Combipackage Amazon!