Terrible product. So I bought Bosch carbide hole saws. good investment Then I realized they need a Bosch mandrel, ok no problem. But here's the problem. Darning attachment too short for Bosch hole saws. I spend an hour looking for them online and order a few other bits but none of this works. How messed up Bosch is. I spent about $30 on Beats I don't need right now. And still can't use a hole saw.