Lifting Eyes are used for lifting PROLINE#153; modular frames and for fastening PROLINE top accessories to the frame. Lifting eyes thread into corner blocks in a frame. Furnished in sets of four with plated finish., Lifting Eyes are designed for overhead lifting in conjunction with shackles and a spreader bar. Use of shackles instead of hooks is preferred. The angle between the top of the enclosure and the cable or chain must be at least 45°. Use only slings and spreader bars that are designed for the specific application and are in compliance with regulations established by OSHA, ASME, ISA, ASTM and other governing agencies.