I use this as an adapter for a mortar stirrer. So far I have mixed over 60 sacks of multi-component mortar and 9 sacks of joint mortar with it. Blade slippage used in both drilling and drilling/impacting through extremely thick mortar was not observed. It's a bit unbalanced which would be a big problem if I was using it for something else. On the other hand, I don't care if I destroy it. It was cheaper than buying an SDS stirrer and if I run into problems I just weld the paddle to the adapter.