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this is a copy from the email from Harbor Freight
"For certain units of the Pittsburgh Automotive 3 Ton and 6 Ton Heavy Duty Steel Jack Stands there is a potential, while under load and with a shift in weight, for the pawl to disengage from the extension lifting post, allowing the stand to drop suddenly."
I have a set of the 6-ton units that I have used on a level concrete floor with no problems but will be returning them.