During a renovation, I wanted to install two LEDs on each rung of a dark staircase. I bought this set thinking that at this price point they would probably dull pretty quickly, but with two bits I could finish my project. I installed modified treads and risers, so I need to drill holes at each end of thirteen 3/4" oak risers and also through the 1.5" pine stair frame. There are 52 holes in total. I never had to break the second bit. I used a hand drill since I don't have a drill. Very handy with my purchase.