Dual rated with more choices of capacityHook blocks are bolted, allowing easy disassembly for complete hook inspection Lightweight and durable all steel construction with powder coated finish and plated external components to resist corrosionPremium US Made Grade 80 Zinc plated alloy load chainSelf-adjusting double pawl disk type mechanical load brake ensures positive load controlHorseshoe chain guard allows operation in any orientationOptional Overload Protection is a one directional clutch that will only slip in the lift direction Meets: ASME/ANSI B3O.21, OSHA, NASA-STD-8719.9ATEX rated ATEX certified II 3 GD c IIB 54o C X for limited use in Hazardous EnvironmentsLong-life fused brake friction disk will not crack, shatter, or absorb moisture