Is the length measured when its in half like in the picture of the 1 or 3 options, or is it the length all the way around?

This is the length of the loop lying flat, not the circumference of the circle formed by the loop. In this case, a 30cm (12 inches) loop would have a circumference of 60cm (24 inches). Expressed another way, if you cit the 30 cm loop you would have a strap 60cm long.

Can this be used for rock climbing anchors?

Yes. It's rated 22 kn, which is just slightly less than a carabiner. These are designed for rock climbing runners, designed to take a fall when used with a dynamic belay.

Can this be used to tie a Swiss seat

If you're going to tie a Swiss seat, the stuff to use is 2 or 3 inch wide webbing i.e., seat belt webbing. My favorite is the mil-spec nylon webbing used on aircraft tie-down straps. Find a CGU-1/B cargo strap on Ebay or from www.skygeek.com and cut out the 20' of 5000 lb capacity webbing. Better still, just buy a simple adjustable harness without padding and gingerbread - the kind used by guide services. DMM makes one called the "alpine." (Back in the day, the climbers actually cut the seat belts out of cars although that would have a been at a time when many cars didn't even have seat belts to begin with.) Another option still is to tie a webbing swami belt and use some cannibalized leg loops.

ASIN	B07PT4JL3Q
Best Sellers Rank	#14,475 in Sporting Goods ( See Top 100 in Sporting Goods ) #3 in Climbing Slings
Brand	GM CLIMBING
Brand Name	GM CLIMBING
Color	Gray
Colour	Gray
Customer Reviews	4.7 out of 5 stars 2,262 Reviews
Item Dimensions L x W	30L x 1.6W centimeters
Manufacturer	GM CLIMBING
Material	Nylon
Material Type	Nylon
Number of pieces	1
Product dimensions	30L x 1.6W centimeters
Size	30cm / 12inch \| Single Unit

GM CLIMBING 16mm Nylon Sling Runner 22kN / 4950lb CE UIAA Certified Climbing Rescue Hanging Rigging Anchor Systems Outdoor Multiple Purposes

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