Never use loose fitting or worn tools on your bike...loose may mean you are using a Metric tool on an SAE sized fastener or vice versa. If fastener seems too tight, do not force it, especially if it does break loose but still is tight... could be cured Red Loctite on the fastener, so sometimes a bit of fresh Locktite has sufficient solvent to leach down into the threads and allow easier removal or use heat gun as a last resort (don't ask how I found out about this). A hand impact tool has hardened phillips bits and the larger knurled handle provides great turning force without damaging fasteners, only rarely will you need the hammer "impact" feature.