Ali's DIYStrong BZP Bright Zinc Plated Heavy Duty Steel Chain 6MM - 1 Metre Custom Cut Length

Has anybody used the 7mm or 8mm chain for a outdoor swinging seat? I will be cutting it to 4 x 80cm pieces

Would this chain be suitable to hang a swing bench outside? And what mm should I get?

What is the length of a single link of the 2nn chain

Are the quoted Widths internal (eyelet size) or external? Needed to see if hooks / padlock will fit through the chain.