21, OSHA and NASA-STD-8719.AMH Walk-e Dog Grip Hoist with Wire Rope Assembly 7/16X66Ft-4000 Lb (contact us for further details) Smooth operation with precise controlTelescoping handle allows the operator to optimize pull and strokeLong service life and low maintenance requiring only periodic cleaning, lubrication and inspectionOverload protection is provided by a shear pin that is easily replaced.