"I needed these for a DIY job and initially they looked perfect. On closer inspection, however, I noticed that there were only holes drilled on one side on all of the 3 strips supplied. The photo shows holes drilled on both sides, as you'd expect. To allow fixing these securely to the floor, I had to drill a series of holes on the defective side.
It's disappointing to find this defect as otherwise these are excellent. Maybe just a bad batch, but I didn't have time to wait for a replacement to be sent."