"Used these to make a new floor in my loft area over insulation. I did drill a clearance hole in the top wood to make life easier, but the screws are still good and easy to drive home, even at 150mm long."
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Review 6 for TurboGold Countersunk Screws 3.5 x 20mm Pack of 200
"didn't realise how easy they bit and drove into timber until I ran out and had to resort to the Wickes equivalent, not only are the turbogold superior, you get twice as many for the same price. Noticed my battery drill lasted longer when using these Screwfix screws. Beware if diving into the box, these screws are sharp."