"I love these. Yes. They are pricey. But do you want your decking or shed to fall apart in the rain?
They screw in every time. No messing around burring screw heads or drill bits. Plus i am confident in even ten years when i dismantle my shed they will unscrew easily. And because they are hex head they screw in the whole way, no 1/2 inch of screw sticking out that just wont drill in anymore.
I used them to screw sleepers together and they hold firmly and confidently.
The only thing is check the box. I am sure it was an innocent mistake. But when i came around to using them a month after buying i realised i had been given the wrong size. Too late to take them back. But the smaller ones i got still did the job great."