This Yoke alloy eye hoist hook for winchlines is manufactured from the finest quality alloy steel. It is quenched, tempered and are 100% magnaflux crack detected. Predrilled to accept YOKE latch kits. All parts with batch number for quality certified and traceability. Hook Code BB to JJ proof tested to 2.5 times of 4:1 WLL as G100 components. They are 20,000 cycle fatigue rated to 1.5 times of 4:1 WLL, Hook Code AA and KK to 1.5 times of 5:1 WLL.