Hi all, Newbie question here. I have been lucky enough to pick up a second hand commercial platform for my son and I, it came with two swivels a D hook and a chain link one both basically brand new. I've tried researching on the web to find out the difference but not getting very far! I'm pleased just to hit it in a straight line "boxing style" however my son is more "into it" anyway the question really is what's the difference between the two?
Thank you.
Thank you.
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