I've tried this with several different power drills, both corded and cordless. The main difficulty with using this bit is that it grips the wood so securely that it ejects the bit instead of penetrating the wood! And the person holding it! It doesn't "slip" or crash into a tree, but rather "sticks" in it (for lack of a better word). I don't think it's a design flaw, rather it's not designed for hand drills. I've used wider bits (e.g. paddle bits) and other auger bits, as well as large hole saws (2 1/2") and haven't had this problem with them. I returned them for a refund, realizing the injury from using them could imagine.