I bought this to drill some 1/2 holes in two 25' W8x40 steel beams. The drill acted funny for the first 50 holes, then I broke two bits. Turns out that the securing screws (M6 x1.0 x25mm) holding the base nearest the drill motor were too short and had pulled out. So I bought two M6 x1.0 x35 screws at the local hardware store and now the drill is working really well. I am drilling 15mm holes at about 40 holes/hour with some clean up as I go. My point is, I needed a drill to build a 23ft bridge and this was much cheaper than having someone else do the steel work. But Just know that you may also need to know what to expect. The bits included with this drill set were actually pretty good quality. I got about 154 holes to go.