Optional overload protection is by one directional slip clutch that only slips in the lift direction Ambient Temperature range 40 deg to 140 deg F 40 deg to 60 deg C Final load test in the USA From imported components Supplied with certificate by serial number Meets OSHA, ASME B3021 and ASME HST3 in addition the ultimate strength is 5 times Work Load Limit WLL meeting structural requirements of ASME HST3 Appendix A, for use in marine and other applications as specified by US Department of Defense DOD APEX rating ATEX certified II 3GD c IIB 60C x for Limited use in Hazardous Environments.