Specification and advantage: Material: Forged 42Cr MO alloy steel. SAE8620H special alloy steel forging and High Strength Quenched and tempered after treatment, according to the standard of EN1677-4. Safety factor: 4:1 Surface treatment: Electrostatic Painting Inspected: 100% individually breakage magnaflux particle Inspected with certification. 200% proof-load tested, with serial number for traceability. Fatigue tested at 1.5 times Working Load Limit for 20000 cycles. Easily readable raise lettering showing the name and PIC code for material traceability. OEM: Advanced manufacture & Testing machine, professional technology Team.