Forged super alloy steel - Quenched and Tempered. Individually proof test at 2.5 times Working Load Limit. Fatiuge tested at 1.5 times Working Load Limit for 20000 cycles. Breakage test. 100% magnaflux crack detection. Surface finish: Powder plastified. Colour code:Red RAL3020/Yellow RAL1003 Brand:DAWSON/OEM Code:DS292 Size:M12 - M30