This shackle has a rather specific purpose--it was designed for use with Ulven's line of Cat Hooks, such as the #113 style of hook (see chart to find the proper shackle size for your cat hook). The shape of this shackle is also unique in that it is compact, and not quite as "bell" shaped as more common anchor shackles. It is made from hand forged alloy steel, right here in Oregon. The strength-to-weight ratio on these shackles is very impressive, and they hold up well in logging applications.
Ulven forest products are designed to be used with and tested with wire rope conforming to the following description: New 6x19 or 6x37 Class, EIPS, IWRC, RRL wire rope made to US specifications. These shackles are for use in logging / skidding or pulling applications only.