10 hours ago, Fisher said:Anybody able to tell me what this block is?
That looks like a railing shape, perhaps the Corrugated Metal version.
Do you know about the F3 window? F3 toggles a window that shows you a bunch of information. One of the bit of information is the name of the block at which you're pointing. Sometimes you need to hold the SHIFT key when pointing at a block for the feature to see past the air block in front of you.
F3 is available in the Prefab Editor and in the game under certain conditions. You might have to be in GodMode in-game.