These are Lewmars newer version of web blockshttp://www.lewmar.com/store?field_block_type=203&lf=0<=4&f=1&o=d
<-- Paste the whole bits of text in bold into your browser window, as Lewmar's link doesn't work correctly.
Here are a few more examples http://www.apsltd.com/catalogsearch/...wmar+web+block
Sadly, they look less versatile than the old style. But there are multiple types of attachments that you can use for them, depending on how they're configured. Spectra or standard webbing, Spectra strops, Spectra tie on's/lashings, pre-fab Loops, Spectra soft shackles, etc.
The key thing in rigging
them is to make sure that the loads created by the lashings, strops, or Loops are properly aligned with the block's strengths. Which can be ascertained via the manufacturer's literature, or contacting them.
There are some good examples of how to tie in blocks both if you look up Loops
, as well as seeing how some of the old Harken
web blocks were/are rigged. And other than the afore mentioned idea sources, you can visit www.APSltd.com
& a few other rigging
sites, in addition to calling, or emailing any of them.
Hope that helps.