I broke two bits drilling holes in my garage floor with a rented hammer drill. What did I do wrong? David D., Boise, Idaho The most obvious possibility is that you hit a piece of rebar, or reinforcing ...

It’s often said that you don’t need a drill bit; what you need is a hole. How you make that hole is up to you, but it’s a given that you want to make it as efficiently as possible. The drill bit, ...