I do all those who have already issued an unconditional buy recommendation for this 6-piece SDS-plus S2 drill set before me, only connect fully. This set is actually absolutely outrageous, especially since here in my view the relationship between the necessary quality, price and performance ratio is absolutely right. I use this set in combination with the hammer PBH 2100 from Bosch. Where it absolutely makes no difference, in which material (reinforced concrete, wood or the like) is also always want to drill. Here fit both sides (hammer drill and drill) together really perfect. Although perhaps this drill set at first glance is a little more expensive than comparable products. In this case, you possibly invest their money in a product that is really worth it. Anyway, I'm so satisfied and therefore awarded with good conscience 5 star and a buy recommendation.