thick steel good welds nice thick paint five stars these seem like decent jack stands i like the added confidence of the secondary pin for security nice large jack stands they held up and seemed very sturdy the double lock makes me feel alot more great and safe and jackpot 6 t10 and i love hold my truck up well and these did not disappoint definitely like the dual locking feature five stars looks good and well assembled well make product with good safety features aye they hold my car up while im under it what more can a guy ask