RedSwing Trapeze Swing Bar Rings, Trapeze Bar for Kids with Adjustable Rope, Locking Straps, Outdoor Swing Set Playground Accessories, Blue

Q: What is the length of this trapeze and is it possible to adjust the length? Thanks!

Yes, the suspension ropes can be adjusted to hang at different lengths, even offset lengths. It's well built, too.

Q: How big of tree branch that M8 carabiner can hook on to?

If your talking about the actual carabiner it would only clip on to a small branch which would definitely not be big enough With the straps that are provided you can easily Hang on a 6 inch branch to 8 inch branch which is normally recommended Safety first! Hope this helps!