Designed to be used with Grade 43 or Grade 30 chain. Heat treated pins. Hooks are heat treated and tempered. Hooks embossed with chain grade, fractional size and country of origin. Hooks embossed with trace code providing traceability through manufacturing and testing process to heat of steel. Design ultimate strength equals 3 times working load limit, matching NACM specifications. Grab hooks are designed to grab a single link of chain on the side to form a loop for dragging, pulling or towing. DO NOT EXCEED the working load limits for chain or components. DO NOT USE for overhead lifting or hoisting. DO NOT USE if the chain or components are visibly distorted or worn.