Even my inexpensive 1/4" Ryobi will snap a 5/16" bolt clean off with ZERO effort. Be very, very careful going with a high torque impact driver you don't need 200+ ft pounds!!!
I prefer the 1/4" as there are more places I can get it into than most 1/2" drivers. Getting deck hardware tight on a 30 to 40 footer should be no problem for even the smallest 1/4" impact driver. Hell you could squish the deck core easily if you can snap 5/16" bolts..
-Maine Sail / CS-36T
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