I purchased a set and got a bit frustrated as the screw slots are not very deep. It was hard to get the screws to track straight and seat the plastic spacers. I ended up taking each one to the bench, pre-drilling the holes deeper and pre-threading them before actual installation. BTW, the screws in the fastening set from W&N are NOT retrievable with a magnet so if you drop one during installation, have a small child on hand.