...after you decided to stick to the ethics (or laws) of hand bolting. One quick wack to the head and everything will be over. If you can bear through it, the heavier weight gives your drill a slight edge over your home hammer and your belayer will thank you for having the leash. And after putting your first bolt in, you'll be enlightened to why all your classics are run out. Now that you got your creds, go buy a hammer drill