I have some slotted screws in big sizes, left over from my boatbuilding days. They are silicon-bronze and pretty massive. used to drive them in with a brace and bit...museum pieces now, I guess. i do remember they were incredibly expensive, but were preferred to stainless steel, particularly underwater, for their corrosion resistance. As mentioned earlier on another thread, one of my boats had a lot of Robertson screws...nice finish, but you need the right driver...
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Is it just me, or do you all like fastenings? I marvel at the huge rust-proof coachscrews i used for decking jobs...bung a socket on your SDS and just drive them home...and those Multi-Montis and suchlike for concrete etc...pilot hole, drive them in, use a socket or whatever...solid! And today's wood screws, of reputable makes, they just do the job for you...no pilot, just drive...how did we ever manage without them? Well, we did, but it's just so much easier now. Only downside i see is the finer shafts, but actually haven't found many problems with strength.