Ok, the 6:1 or 7:1 is probably all you need for purchase, but what about the breaking strenght of the blocks them selves?

model h194

Shackle pin dia. (in) 1/4
SWL (lb) 500
Breaking strength (lb) 2000
Use with 004 - 5:1 / 048 - 6:1

verses the h2630 at
SWL (lb) 1800
Breaking strength (lb) 4500
Holding power w/180 degree wrap 50 lb (23 kg) 10:1

I assume the SWL is the swivle breaking strenght?

Is this an issue on a h16?

Sam