"i have used boxes of these type of screws on a summerhouse decking framework and building structure (about 20 feet square) and found them to be excellent. i used the 6.3mmX100mm size for the 50mmX150mm timbers and while you can drill them in without drilling a pilot hole first, i would advise doing so, that way you don't strain the drill you use too much. i recommend either a sparky bur 350 or a milwaukee 28volt battery drill, they both have the same power for doing the job.
the joint they make is very strong and should last the lifetime of the structure. the wood will rot before the screws need replaceing. i highly recommend these type of screws."
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Review 9 for Turbo Coach Screws Zinc and Yellow Passivated M8 x 100mm Pack of 50