These are the worst hex index drills I have ever seen. I've only had it for 2 or 3 months and at least 6 small parts broke during use. And they were NOT used in difficult conditions. One of the bits actually popped out of the hex shank holder when it hit the unexpectedly dense wood. I had to use pliers to pry the drill out of the drilled hole. ALL bits broke when DRILLING WOOD (NOT METAL) - 2X4S, MEDIUM PINE, FIR, ETC. Do-it-yourself standard building materials. I used one of Milwakee's best M12 volt drills, following the ROP recommendations for the drill. a horrid waste of time and money. PURE CHARACTER. DO NOT BUY!