CROSBY G-335 MISSING LINKS Forged Steel - Quenched and Tempered. Integral rivets join the two halves. After making connections, rivets must be peened. Meets or exceeds the performance requirements of Federal Specifications RRC-27lD, Type II, except for those provisions required of the contractor. Not Suitable for use with Grade 80 or Grade 100 chain and chain slings used in overhead lifting.