The flush pin shackle is yet another specialty logging shackle. It's design makes it smooth and relatively snag free, and the pin is tightened with a standard 1/2" drive socket wrench. According to OR OSHA, a flush pin, straight-sided shackle must be used to connect the eyes of lines if: (a) The shackle will be crossed by a sheave, or (b) A sheave will be crossed by the shackle. 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.