Nikos, they are variations of Euro 4 and Jap 4. They have different names because... they're different. Yes, you just double every ring, but that's still a difference. If you just want to call them 'doubled Euro 4-in-one" etc., no one's going to complain.
Really? Cool. I found it in a random Image search. Awsome!
I had a guy making me a shirt of that in Galvanized, 14 gauge for the larger rings 18 for the smaller. Unfortunatly he had some real world problems and was forced out. I kinda picked up his slack in the group here in the Fox Valley.
I hope he returns some day because he could teach me alot.
Yes, you just double every ring, but that's still a difference. If you just want to call them 'doubled Euro 4-in-one" etc., no one's going to complain. 