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So if I decided not to go with the dmm block, which would be better? CMI or ISC? I've read on treestuff "ask an expert" that a CMI block which is 5/8" are only compatible with a 5/8" sling(upper sheave), but other blocks(ISC/DMM) will allow 3/4" slings.

Thanks for the info fellas.

I'm not to familiar of a rig and ring and how it works. At work I've only seen and heard of my foreman talk about using a block and port a wrap

So I'm looking to purchase my very first rigging setup in the near future. I would like to get the dmm impact block(5/8") and also the medium port a wrap(5/8"). I know by purchasing the 5/8" impact block, I will have to use a rigging line that's 5/8" or less, but what size can my whoppie...