1) Hooks and side plates are forged alloy steel and heat treated. 2) Shackles and yokes are forged and heat treated steel. 3) All parts are forged. 4) Can be furnished with bronze bushings or sealed roller bearing s. 5) Opening feature permits insertion of rope while block is suspened. 6) Pressure Lube fittinggs. 7) Hook and shackle assemblies can be interchanged. 8) Blocks furnished with dual rated wireline sheaves. 9) Fatigue rated.