content: I was drilling 3/4" dia holes 2 inches deep in concrete to install a pool cover when the drill just died. First thought my extension cord was unplugged.I have 14 of the 22 hoes complete and had to shut down.I had drilled about ten 3/8" dia by 3" deep holes about two months ago.In addition, the chuck kept loosening on me.My first Bosch tool and my last.