Grade 80 (G80) Alloy Steel Chain: Standard heavy-duty blocks utilize hardened, heat-treated G80 galvanized load chains (typically 6mm diameter) to resist friction and wear.Mechanical Brake System: Engineered with a dual-pawl automatic braking system that holds the weight securely when you let go of the hand chain.360° Swivel Hooks: Drop-forged top and bottom steel hooks are equipped with spring-loaded safety latches to prevent accidental unhooking.Internal Ball Bearings: High-quality gear transmission cages reduce friction, meaning it takes minimal pulling force (roughly 300N–340N) to raise a full 1-ton capacity load.