Twin Clevis link "H" Body is Carbon steel, Pins are Alloy steel Quenched & Tempered MBS=4XWLL Twin Clevis link "H"1.Body is forged and heat treated Carbon or alloy steel 2.Pins are made from Queched&Tempered Alloy Steel 3.BL=4*WLL4.Size: 1/4"-5/16", 3/8", 7/16"-1/2", 5/8" Twin Clevis link