I made the mistake of thickening the door without checking the length of these screws so I had to replace the screws. This is M8-1.25. They screw 1" into the handle and since my door is about 2-1/4" thick I went with 70mm (about 2 3/4") screws. DO NOT BUY STANDARD IMPERIAL SCREWS, THEY WILL NOT FIT. I believe this set is for doors 1" to 1-3/4" thick.
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