No. 1, 2, 3 have a wire thickness of 1.6 mm and an outer eyelet size of 6 x 9 mm.
No. 4 has a wire thickness of 1.7 mm and an outer eylet size of 7.5 x 10 mm. p> You can find the carabiners that we can recommend for the chain under codes 790505 and 730926.
The chain is not designed for heavy loads.