https://www.screwfix.com/p/easydrive-hex-bolt-self-tapping-coach-screws-8mm-x-100mm-10-pack/2417T?kpid=2417T&cm_mmc=Google-_-Datafeed-_-Screws%2C%20Nails%20and%20Fixings?kpid=KINASEKPID&cm_mmc=Google-_-TOKEN1-_-TOKEN2&gclsrc=ds&gclsrc=ds
I would use an 8mm clearance hole in the beam and a 5mm...