Forged anchor shackles are hot dipped galvanized. Meet Federal Specifications RRC-271b. Type IV. Size, work load and trademark permanently marked on each. Loads are based on safety factor 5 to 1. When tested all are pulled at uniform rate of speed in a direct tension. Any deviations as angular lifts, shock loads, modification of basic forging will result in drastically reduced maximum loads. Anchor class 1, screw pin type. Sizes with asterisk* are safety shackles. Sizes available 3/16 - 1".