I had a chain break on a API climber while going up this year. I was about 15 feet up and the the climber came off in my hands. The chain
was made in Taiwan. I called API they sent me a chain made in the USA
it looks alot stronger. I suggest you check your chains for any bad links. The box from the replacement chain said replace them every 3years I did'nt read that when I bought the stand. I now use my summit climber with cables.