I'm getting a length of 2"x 6" to attach across 5 joists, and was told on the middle joists to use bolts to attach the hanger through both the plank and middle joist. The joists are only 50 mm wide. I think I should get 6" bolts for the hanger, but what about the other 4 joists/8 holes to make? Should they be 6" bolts too? Or 6" wood screws? Whats the difference between these 2 choices and are they both good for my purposes? https://www.screwfix.com/p/goldscre...k-multipurpose-screws-6-x-150mm-50-pack/13602 https://www.screwfix.com/p/turbogol...k-multipurpose-screws-6-x-150mm-50-pack/22125 The hanger has not the most perfectly round of holes, I measure the hole at between 15 and 12 mm diameter , what diameter bolt should I get? Thanks all.