LOL...I'm strictly a layman, I just googled it and concluded that it's a greater diameter than the pipe. Probably academic anyway, as it's obviously wrecked the plan.
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
CUF CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch