"I've used these and other sizes in timber construction to save time rather than having to drill holes and bolt members together. As an Engineer I've also specified them on countless projects as they have great structural properties. One thing to be aware of is that you need a powerful driver to put these in!"
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Review 5 for Heco Topix Csk Woodscrews 8 x 200 Pk10
"Bought the screws to fix sleepers. Super fast delivery and when i was able to use them they did a great job. The problem was when i received them they wereT40 drive. Not ausual size. Guess what? Screwfix dont sell a T40 driver bit. I phoned product support and they confirmed the reason i couldnt find them on line was because they didnt sell them. In fact only found one outlet selling them 30 miles away. Visited my car accessories shop and bought a bit plus a 1/4 drive socket and bodged it into my drill. Finally tried to screww into a oak block and the srcrews worked better than expected"