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Never heard of them do tell all I've ever used is shackles with my Bubba rope. Bubba Recommends Shackles here's the chart from there site.
Shackle Size Pin Dia Weight(lbs)
Lil’ Bubba
1/2" x 20'
Breaking Str: 7,400 lbs 1/2" WLL: 2 tons 0.63" 0.72
Bubba
7/8" x 20' or 30'
Breaking Str: 28,600 lbs 3/4" WLL: 4.75 tons 0.88" 2.35
Big Bubba
1-1/4" x 30'
Breaking Str: 53,200 lbs 7/8" WLL: 6.5 tons 1.0" 3.62
Jumbo Bubba
1-1/2" x 30'
Breaking Str: 74,000 lbs 1" WLL: 8.5 tons 1.13" 5.03
Extreme Bubba
2" x 30'
Breaking Str. 131,500 lbs 1-3/8" WLL: 13.5 tons 1.50" 13.53