I enjoy drilling holes in clients' homes because this drill bit gives me confidence lol. That's all I have to say. :) Also if you are looking for a great rock drill I recommend DeWalt (DWD520K) (wired) or DeWalt (DCD796D2) (wireless). First, get a cordless drill. It looks small but has sooooo much power. Just make sure you set it to the "Hammer" setting before you drill lol.