Forged super alloy steel -Quenched and Tempered Individually proof test at 2.5 times Working Load Limit Fatigue tested at 1.5 times Working Load Limit for 20000 cycles Breakage test 100% magnaflux crack detection Brand:DAWSON/OEM Code:DS771 G80 / Grade 80 Forged Super Alloy Steel Clevis Self-locking Hook Size:8-16MM